Chevy Rear End Gear Ratio Chart

1971-1975 : Front of Right hand (passenger) tube,about 3" from carrier; 1970 : W/C-lock axles-Front of Right hand (passenger) tube,about 3" from carrier. 10:1 rear axle ratio. How to Read a Chevrolet Truck VIN Number for the Axle Ratio by Jody L. Rear Gear Ratios Forum Date; rear end. 42 Ratio (With (LC9) Vortec 5. The most popular rear end ratio in trucks today is the 3:55, which sort of averages towing power and fuel economy. Instructions. You can get a lot of different gear ratios if you want to rebuild a rearend. You can count the ring teeth and divide by the pinion teeth for the ratio. For example, I changed my Nova's axle ratio to 3. Nitro Gears are available for all types of vehicles. A commonly overlooked component of a vehicle’s drivetrain that has a large effect on fuel economy is rear end gearing. The last three numbers are the gear ratios. 73:1 gears at 4,400 rpm. On OEM gear sets, the ratio is usually stamped on the ring gear edge. Melting Temperatures of Metals. Most cars and trucks with low rear end ratios will take a 15 tooth drive gear. Most of my driving is in the city but. Example: 5480 ÷ 5220 x 4. Our Heavy Duty Transmissions have found great success in areas outside of Rock Crawling from multiple Baja 1000 and SCORE off-road events to many Pro-Am Drift events. com GM 8 5" and 8 6" Axle Parts Gears and Upgrades from chevy 10 bolt. This is also a great tool to use in the garage, trailer or on the road. Rear end gear ratio options - 74 Nova Drivetrain & Performance Rear end gear ratio options - 74 Nova - Chevy Nova Forum Steve's Nova Site is an automotive enthusiast website dedicated to the 1962 - 1979 Chevrolet Nova, Chevy II and Acadian automobiles. Leading provider of high performance automatic transmissions, torque converters and drivetrain components for race, street/strip, hot rod, street rod and towing. Whip out your calculator and follow along. 454 AXLE RATIOS & IDENTIFICATION 0 1997 ADP Claims Solutions Group, Inc. 73 to one, 3. 6 speed as well as rear axle ratios. of 1964-and-later GM pickups, and in the rear of 1984-91 3/4-ton Suburbans. Price is $200 or best reasonable offer. Calculator for the right gear ratio on the speedometer. 38 to 1 ratio ring and pinion, you can cruise at 65 mph. Low ratio gears like "2. 10 bolt street gears are designed to withstand the rigors of everyday driving, as well as a weekend at the track. Racing Forums. (Note: The calculator converts under the assumption that one unit of the gearbox is fixed (sun, planet carrier and annulus gear), therefore does not rotate). 55) is going to be a lower ratio and give you better acceleration. I can't see the pinion to see if there are any numbers on it but if its a 9 tooth l would have a 3:55. Because the pinion is smaller in diameter than the ring gear, the drive shaft will spin at a higher speed than the axle shafts and wheels. 03 first gear and. Instructions. 12 by your Jeeps tire diameter (Example:. Enter R&P Ratio, Tire Height, Speed (mph), and Transmission Ratio, then click Solve to calculate RPM. GM: 1500 HD t: Ring Gear Bolts: 12 12mmX1. Note: Drive gear refers to the gear that is on the transmission output shaft. This was done as a direct result of the 1973 oil crisis. What Gear Ratio is My Rearend? You can find your gear ratio easily with this method. Fractions To Decimals. Stock rear end gear ratio in 2006 Chevy silverado 1500 Z71? All you need to do is write the VIN# down and call a GM dealer and ask for parts. Constant-velocity joints were used instead of universal joints. As a general rule, when dealing with two gears, if the drive gear (the one directly receiving rotational force from the engine, motor, etc. Ring-and-pinion selection made easy! Save yourself the headache and let us figure out your ring-and-pinion gear ratio! Just type in your info (example: 5000 RPM), press calculate, and you'll get the right ratio without the guesswork. 00 as this is the typical 4th gear ratio of most 4 sp and 5 sp manual transmissions. LKQ SKU: LKQ701 ~218342262 RAX01965B. Visit Dave Arbogast in Troy OH serving Troy, Dayton and Vandalia #1GCWGBFG0H1165591. No lol, there aren't 4. RPM Calculator Instructions This calculator is designed to give the approximate engine RPM (revolutions per minute) based on data entered. The Rear Axle. com GM 8 5" and 8 6" Axle Parts Gears and Upgrades from chevy 10 bolt. How to figure gear ratio. For Overdrive cars mutliply the overdrive ratio times the rear and gear ratio. 10:1 rear axle ratio. The numbers should let you know what gear-ratio came from the factory, the date of production, where the unit was assembled, and whether the carrier is Positraction or not (see charts). Enter your new tire diameter, your old tire diameter and your present gear ratio to find out your new gear ratio Convert P-Metric Tire to Tire Diameter Inches Convert the funky P-Metric Tire # (Example: 195/75R15) on the side of your tires to Inches, so you can use more of these rearend calculators!. It's equivalent to the M20 muncie with a 5. this means that dimension "C" is usually longer than dimension "B". I personally feel that the gear splits in a TH-700R4 are great for street driven cars as long as you don't get too crazy with the rear end gearing!. GEAR RATIOS: Factory 8. Much has changed over the past 5 years or so with axle ratios. With a simple Google search you can find a chart of axle codes. 12 X 38" = 4. Somebody on here posted a chart or a link to a chart with various Ford products axle widths. 3 ways to find rear end gear ratios. Thanks, Jeff. 08, Optional axle ratios include 3. I will be using either a T5 or TKO500 trans so trying to figure out the best rear end gear ratio. Axle ratios had to drop to get the better gas mileage the EPA demanded. You can count the ring teeth and divide by the pinion teeth for the ratio. 4375-inch left-hand thread on all 8. Does any body have a chart that shows what color/tooth count coincides with what. : this calculator allows you to enter 3 of four variables and it will compute the other based on your input. This calculator assumes you know the vehicle's transmission ratio. The only difference is the rear gear ratios 3:73 vs 4. com History and Identification of Chevy 10 and 12 Bolt Chevy Differentials from chevy 10 bolt rear end gear ratio chart , source:chevydiy. mc2204 hyd 3 214 214 288 288. The accompanying charts show what gears were manufactured for each type transmission. 5″ 10 bolt, which is about 58/5″ wide. The addition of larger tires can greatly decrease performance and fuel economy. Fifth-wheel trailering with a Silverado 1500 requires Z85 Handling/Trailering suspension or Z71 Off-Road suspension. 55 rear end center section is an original used two-pinion type with cast arma-steel housing. No photos of the actual Axle Assembly are available. Note that the resultant gear ratio is just the product of the two separate gear ratios - (T1/T2)*(T3/T4). I personally feel that the gear splits in a TH-700R4 are great for street driven cars as long as you don't get too crazy with the rear end gearing!. Using only authentic OE approved and tested parts, Power to Deliver components will provide the proper fit and function required to avoid noise, vibration and harshness that leads to customer satisfaction. 71- Newer 2wd GM trucks use a 5 on 5 lug pattern 71-76 Full Size GM Cars " "" "" "60" 60's GMC and some Chevy's Dana 44 or Dana 60 with leaf springs 6 lug, Gear ratio's 3. Drivetrain com Discount Automotive and Truck Parts Ring and Pinions, Transmission and Transfer Case Parts, Overdrives, Positractions, Towing products Free technical support 800 216 1632. If it rotates 3 3/4 turns, the gear ratio is 3. 21 Dana 44 used a standard Chevy 1310 yoke, Dana 60 used the heavy duty yoke which takes the larger 1350 yoke. The VIN tag or crawl under the truck and locate the actual differential tag. If you take a few moments to study the gear chart for your transmission and rear end ratio combination you will see why this product is so popular. 10? i looked at that chart and. so long as the trans is not an overdrive the final gear is 1:1 so it really deosn;t matter what kind of trans you have. GM 12 bolt axles The ultimate Chevy rearend Hemmings Motor News from chevy 10 bolt rear end gear ratio chart , source:hemmings. Transmission Gear Ratios If your planning on swapping in a different transmission or just curious on your gear ratios, the following charts will be helpful. To determine the correct gear ratio of the speedometer for your car, use the following formula to calculate the number of teeth on the driven gear (round to the nearest available gear):. 42 Ratio (With (LC9) Vortec 5. Check out the deal on Yukon Gear & Axle GM & Dodge 11. These ratios are very nice for street use with a rear axle ratio of 3. 18 Ratios These Specialty Ratio gear sets are for SB cars only, lightweight cars such as dragsters, or low torque, high RPM combination cars. The axle code, if on the differential, is comprised of one or two letters for 1964-'70 models, followed by a three-digit build date. The value will be returned in estimated differential gear ratio, based on the entered values. count and gear ratio. The axle model number will be cast into one of the webs as shown (3), or it can be on the nose. Both the transmission & rear end need replace … read more. Used 2017 Chevrolet Express Cargo Van 2500 RWD 155 Full-size Cargo Van Visit Ken Garff Automotive Group in Salt Lake City UT serving Ogden, Bountiful and Draper #1GCWGBFG3H1294828. 88 turns or 5. 11 rear gear axle ratio, adding extra wear to the engine and to your mental state. Remanufactured differential. Parts ship same day!. From 1968 to 1970, rear axles were 8. Power is transmitted from the transmission to rear end 1:1 in. 55 axle ratio. What can you say about an axle that has been used by the military for years, is readily available and can stand up to just about any abuse you can dish out? Sure, it's heavy and only comes in one gear ratio, but for the serious 'wheeler who runs big tires on brutal terrain, it's the Holy Grail. Multiplying 3. Strange Engineering Ring and Pinion Gear Ratio Calculator. Find Overall Crawl Ratio: Ever wonder what your low-low-low gear ratio is, your "crawl ratio"? You'll need to do a little research by finding out the transfer case and transmission ratios first. You're going to have to put the car in nuetral or out of gear, so safety first! Do this on level ground, and be sure and chock the front wheels so the car can't move. 73 x 747) ÷ 1,001 = 22. The top 8 digit number is the axle assy part number. 90:1, and installed 26-inch tall tires. The car is in the final stages of paint,then reassembly begins. A chart showing optimal gear ratios for lifted vehicles with larger tires to obtain the best power ratio. 11 rear would give you 10. Is there a place I can look to find the gear ratio for ther rear end of my 1964 c10 stepside truck? It has a 12 bolt rear end in it. Click on Calculate. This means cutting 2. A lower axle ratio offers more fuel efficiency and quieter vehicle operation but will have slower acceleration and lower Trailer Weight Ratings. 18 Ratios These Specialty Ratio gear sets are for SB cars only, lightweight cars such as dragsters, or low torque, high RPM combination cars. Visit Chevrolet of Naperville in Naperville IL serving Aurora, Bolingbrook and Romeoville #3GCNYAEH2KG307428. Include a chart with RPM's at 60 MPH for various tire sizes and rear end ratios. More Old Online Chevy Info WebCounter says that you are visitor number: to this site. Because axle gearing is so crucial, here is the quickest way to figure your Jeep's ratio: Jack up both wheels. Gear Ratio and Tire Size Calculator - 4x4 and Jeep Ring & Pinion When you change your tire size you need to make sure you have the right gearing to get optimal fuel economy and power. The 8sp with 3. Primary Gear Reduction Ratio: to 1 (If you are not sure what this is, make it 1. 10:1 rear axle ratio. Rear Axle Identification & Decoding Identify the gear ratio, the build date, the plant where it was assembled the work shift when it was assembled, and positraction source - if equipped. 6 inch disc brake type rear differential assemblies. Some of the shop manuals get vague on these trailering option ratios and refer to them as Special Car Order rear axles. : this calculator allows you to enter 3 of four variables and it will compute the other based on your input. PONTIAC Axle Gear Codes Wallace Racing Code Location. but the fuel Consumshion is Very Bad too. 55 Rear End Differential OEM USED-This 1955-1956-1957-1958-1959-1960-1961-1962-1963-1964 Chevrolet 3. com Gear ratio info from. The D28 can be re-geared; however, units with the 3. They feature a massive 10. How to tell the difference between a Ford 9 inch and an 8 inch rear end/differential - Part 2 - Duration: 3:08. Output Speed = Input Speed / Ratio of Gear Increaser. When servicing the rear axle, the third letter of the code must be known in order to determine the identity of the rear axle manufacturer. Gear Ratio Calculator. GM 10 bolt 8. 52 first gear times the rear end ratio of 3. Because axle gearing is so crucial, here is the quickest way to figure your Jeep's ratio: Jack up both wheels. a wrecked 1993 chevy 4wd truck. RPM Calculator. This Information is for Research and the Promotion of the Preservation of Older Chevys. In 2008, the only optional factory gear ratio available is now 3. 10 to one (commonly written in the following manner 3. The top 8 digit number is the axle assy part number. Most cars do not have it. 10 final gear ratio with tons of aftermarket R&Ps for just about any application. Late Model GM Manual Transmission Gear Ratio Chart T-56 Six-Speed (Corvette) Type First Gear Second Gear Third Gear Fourth Gear Fifth Gear Sixth Gear. 3L V8 Engine, Requires (K5L) Heavy-Duty Cooling Package) Option 2. You must leave a question mark "?" Rear End Gear (ratio) Trans Gear. Engine's Compression Ratio; Fuel Injector Flow from change in Fuel Pressure; HorsePower from Intake Airflow; Horsepower gain from adding Blower Pressure; Intake Airflow from Horsepower; Rod Stroke Ratio; Stroke Size Rear Gear Requirements. 5 inch differential on. This is the ratio of gears in the rearend (differential) that you may have heard of in the numerical terms 2. 8 inch Ford rearend with 3. Mark the inside of the tire with chalk for a reference point. 42 rear axle. 1st, 2nd and 3rd gears are the same ones used in the L ratio gear set, but the ratios change because the L and K inputs have different tooth counts. 5" Chevy 10-Bolt Rearend Posi - 30 Spline, Gear, Bearing Kit Package - 3. This is the ratio of gears in the rearend (differential) that you may have heard of in the numerical terms 2. Enter R&P Ratio, Tire Height, Speed (mph), and Transmission Ratio, then click Solve to calculate RPM. This calculator is a useful tool that will do the math to help you figure out the gears that are needed to make your speedometer work correctly. Drag Racing Axles, Ford 9 inch Rear Ends, Drag Race Struts, Drag Racing Shocks, Racing Axles, Drag Race Brakes, Rear Axles, Dana 60, Ring and Pinion. Dynatrac products are designed using the finest materials, processes and engineering available, and its products are backed by the best service and warranty in the business. Standard Rear Axle Ratio, 3. Example: BL 1122 G2 For a 68 or 69 model, this is interpreted as a 3. Both of these are semi-floating axles. Use this gear ratio calculator to select the best ring & pinion and gear ratio combinations to serve your needs. 55-64 Chevy gear ratio ? The pumpkin is different on the 370 411 & 456 The housings will take all rear-end ratios. I am in the market to by a 14+ Laramie Longhorn but I want to make sure that the truck has 3. ***Call Zumbrota Bearing and Gear at 1-800-658-2537 ext 125 for customer service, availability and technical assistance***. 88 I had to go with series 3 carrier, series 1 being 4. As a general rule, when dealing with two gears, if the drive gear (the one directly receiving rotational force from the engine, motor, etc. Much has changed over the past 5 years or so with axle ratios. Classifieds. 2) You have to know the rear end gear ratio. G80 is the locking diff. 2" BOP axle including ring and pinion sets, rebuilt kits and bearings, differential covers, upgraded axle shafts, heavy duty u-joints, and more. 42 Ratio Rear End Gear Set for `68-`70 Buick 8. If you put a factory posi in a 55 -56 the axles. Note that there are two. Parts ship same day!. You can count the ring teeth and divide by the pinion teeth for the ratio. Gear Ratios of a SM465? Does anybody know what the other gears are (specifically the 4th gear)? To view links or images in signatures your post count must be 10 or greater. The transmission has it's ratios for gears 1-5 or whatever. com History and Identification of Chevy 10 and 12 Bolt Chevy Differentials from chevy 10 bolt rear end gear ratio chart , source:chevydiy. Choosing the right differential gear ratio will help regain lost power and torque. East Coast Gear Supply offers wholesale discount prices on GM 10 Bolt 8. Home » Charts » 14 Inspirational Chevy 10 Bolt Rear End Gear Ratio Chart Photograph » Chevy 10 Bolt Rear End Gear Ratio Chart Fresh Gm 8 875" 8 9" 12 Bolt Passenger 12p and Truck 12t Axle Parts Pics. This will help you pick the right size tires, transmission and gear ratio combination for your classic. 42 ratio (opt GU6). 5" ring gear configuration. Ring Gear Torque = input torque x axle ratio. Examples of this would be a 3. Or, change input variables (engine RPM, axle gear ratio and tire height) to determine vehicle speed in each forward gear. Engine's Compression Ratio; Fuel Injector Flow from change in Fuel Pressure; HorsePower from Intake Airflow; Horsepower gain from adding Blower Pressure; Intake Airflow from Horsepower; Rod Stroke Ratio; Stroke Size Rear Gear Requirements. The best ratio is to have your engine run at the sweet spot RPM at the speed you will be running most of the time. I do 3000 RPM at 55 mph on the highway and it's not fun fighting for the slow lane when your engine rev's like that for extended periods of timeit calculates to a 4. Dana 44 axles have an 8-1/2″ diameter ring gear and now come standard on the rear end of all Jeep JK Wranglers. If you went the other way and changed the rear axle ratio, the engine would scream—4000 rpm at 75 mph with a 4. MPH = RPM * Diameter tire / gear ratio * 336. The defaults show suggested values. spark plugs, points). Since the left wheel travels farther than the right wheel, it must rotate faster than the ring gear and differential case assembly. The rear axle ratio is the number of times the driveshaft turns for every one wheel rotation. The table below will help you determine what rear end ratio you have by using your RPO code, answering the question: What rear end ratio was in my Chevrolet or GMC vehicle when it left the factory. 73 to one, and 4. Nitro Gear & Axle® take the steps. GVWR), drive-axle ratio options increase substantially, depending on the manufacturer. If unknown, please consult your local mechanic as these items are critical to selecting the appropriate differential unit. 73:1 gears at 4,400 rpm. 73 gear will it perform good with mild street. When servicing the rear axle, the third letter of the code must be known in order to determine the identity of the rear axle manufacturer. The value will be returned in estimated differential gear ratio, based on the entered values. If you do not know this ratio, you can simply put in 1. 56 ZF Six-Speed Type First Gear Second Gear Third Gear Fourth Gear Fifth Gear Sixth Gear. Chart showing transmissions offered and gear ratios. 5" diameter ring gear and pinion with a 3rd bearing at its nose that prevents gear deflection under severe loads. Your primary drive, transmission and rear drive sprockets all combine to determine your cruising rpm as well as your final top speed. know either how much torque these trannys were designed for or what GM engines they were used with. 73's in an F250 should be plenty only hauling 4k lbs. This was done as a direct result of the 1973 oil crisis. Gears, axles, locker, limited slip, kits, driveshafts, transfer cases and more. My 94 definately has 2. The two letters designate the gear ratio, and the numbers indicate the month-day the rear was ASSEMBLED (the casting date on the left side indicates the day the molten iron was poured into the mold). All you need is a jack, some jackstands, and knowing how to count helps too. 2" BOP axle including ring and pinion sets, rebuilt kits and bearings, differential covers, upgraded axle shafts, heavy duty u-joints, and more. History and Identification of Chevy 10 and 12 Bolt Chevy Differentials from chevy 10 bolt rear end gear ratio chart , source:chevydiy. I belive there where two Gear Ratios that You could get from the Factory with the Tow Package. If your front axle only has 4. com Chevrolet Full Size and Impala Rear End/Axle Assembly Codes from from thecamaro. Tire Height (in)* Enter your tire height here. 15"/16"/17" tires (800-815 revolutions/ mile). 25 3300 ford reg 1971 17 3. Rear End Gear Ratio Question Have a few people looking for a 94-98 unit and will get an axle kit from Richard at North Racecars to get to the proper width. 10 & down gear ratios, can instantly lock differentials and allow you to tackle the. Ford 1932-54 Transmission Gear Ratios: Home Parts Drawings Web Links Tune-Up & Service Serial Numbers Engine ID Trans Identification Model ID Terms of Sale Contact Us Our Online Store Our Catalog. Drive Gear Teeth - Number of teeth on the transmission side of things Rear End Ratio - Rear Gear Ratio (3. 21 Dana 44 used a standard Chevy 1310 yoke, Dana 60 used the heavy duty yoke which takes the larger 1350 yoke. 73 ratio (opt GT4) SILVERADO 3500 PICKUP Chassis Cab wide track (opt GTY) Automatic Transmission 4. The higher the numerical number of the ratio, the truck. It's equivalent to the M20 muncie with a 5. 10, and a 4. The only way it wouldn't be there is if someone already changed the gears and didn't replace the tag. ) But here is a basic chart to help you decide: Although you should take the time to do the math and find out which ratio is best for your truck and tire combination, to make things easier we've put together the following chart. I have been trying to find it again but have been unsuccessful in locating it again. Not sure what "properly equipped" means, perhaps correct hitch, trans cooler, etc. GM High Performance Vehicle Operations have developed the new Performance Package Option for the Cobalt SS/SC to give the supercharged coupe an edge on the track. See the Owner's Manual for your Chevrolet vehicle for additional guidelines and trailering tips. This calculator will provide the speed of the vehicle based on the transmission gear ratio, the engine RPM, the tire height, and the ring gear and pinion gear ratio in the rear end axle differential housing. 71- Newer 2wd GM trucks use a 5 on 5 lug pattern 71-76 Full Size GM Cars " "" "" "60" 60's GMC and some Chevy's Dana 44 or Dana 60 with leaf springs 6 lug, Gear ratio's 3. I am in the market to by a 14+ Laramie Longhorn but I want to make sure that the truck has 3. Ring & Pinion service provides quality professional differential repair and maintenance for Ford, Chevrolet, Chrysler, GM, AMC, Jeep and Toyota Vehicles. A while back I came across a post where someone had compiled a wonderful chart on this forum comparing 4 speed vs. My 1993 Chevy Cheyenne K 1500 4wd LB ring gears teeth are in pieces due to a lock up in the rear axle. MPH = RPM * Diameter tire / gear ratio * 336. '57 Olds rear end is same width as '57 Pontiac & '57 Chevy, but used coil springs and requires welding on 2" wide leaf spring perches to fit into '55-'57 Chevy. 73 to one, and 4. Where there are no RPO/engine information following the rear axle code only means I do not have build sheets to verify them. The superior quality of these gear sets is the result of years of racing development, outstanding design, and state-of-the-art manufacturing methods. You enter your tire diameter and your rear end gear ratio and it will display vehicle speed an RPM range from 1000 - 8000 RPM. Each gear produces a different number of revolutions. What Gear Ratio is My Rearend? You can find your gear ratio easily with this method. com Chevrolet Full Size and Impala Rear End/Axle Assembly Codes from from thecamaro. Axel Power Garage 161,488 views. Late Model GM Manual Transmission Gear Ratio Chart T-56 Six-Speed (Corvette) Type First Gear Second Gear Third Gear Fourth Gear Fifth Gear Sixth Gear. Both have the 5. I may be looking at the wrong thing? but I doubt it. 11 combo but is it ok to be. Sport Truck Tech brings you a complete rear end guide and bolt pattern guide. Rear Axle Gears and Driveshaft. Remanufactured differential. Multiplying 3. I searched, but no luckcan anybody help with that? While I am not actively working on the '69 Maverick project, I have collected some parts. RPM - Rear End Ratio Chart: The chart below may be of some help in deciding what rear end ratio is right for you. The number of times the driveshaft rotates equals the gear ratio. History and Identification of Chevy 10 and 12 Bolt Chevy Differentials Chevy 10- and 12-bolt axle assemblies have been standard equipment on GM passenger cars, muscle cars, and trucks for decades. That data consists of the ring gear and pinion gear ratio, the height of the tires (diameter from ground to top of the tire while mounted on the vehicle) and the transmission final gear ratio. This is usually known as the "final drive" gear ratio and unlike the transmission, is not usually "shift-able" (although you can disassemble the axle/transaxle and replace the gears). Does any one have any back on the gas mileage for the above configurations. (Note: The calculator converts under the assumption that one unit of the gearbox is fixed (sun, planet carrier and annulus gear), therefore does not rotate). 52 and multiplying that by the 4. We do not get this question as often as I thought we would, but we get them. When stock parts just won’t cut it, G2 Axle & Gear has what you need to make your 4x4 faster, stronger and more reliable. You can typically find your RPO code on driver side door panel or glove box. How to Read a Chevrolet Truck VIN Number for the Axle Ratio by Jody L. Dana Differential ID Profile & Information. These RPO codes are used to idicate a specific type of differential and/or ring gear size. The only difference is the rear gear ratios 3:73 vs 4. 2-liter V8 engine are both available with a Max. 1982 to 1984: 7. Campbell You're going to need the vehicle identification number (VIN) number to obtain the axle ratio for your Chevrolet Truck, but even after you decipher the VIN and its sequential meaning, you're going to have to do more leg work. Gear Ratio and Tire Size Chart NEXT PAGE This gear ratio and tire diameter chart is meant to give you an approximation of ideal RPMs at highway speed (65 mph) for three situations: fuel economy, every day driving and increased towing power. com History and Identification of Chevy 10 and 12 Bolt Chevy Differentials from chevy 10 bolt rear end gear ratio chart , source:chevydiy. After changing rear end gears or tire diameter you will likely need to swap one or both speedometer gears to keep the speedometer reading correct. I may be looking at the wrong thing? but I doubt it. mc2204 hyd 3 214 214 288 288. Spend some time in the left hand lane! With our new 3. of 1964-and-later GM pickups, and in the rear of 1984-91 3/4-ton Suburbans. 73 x 747) ÷ 1,001 = 22. Check out the deal on Yukon Gear & Axle GM & Dodge 11. This article applies to the Chevrolet Silverado GMT800, GMT900, and K2XX (1999-Present). Dana 44 axles have an 8-1/2″ diameter ring gear and now come standard on the rear end of all Jeep JK Wranglers. All you need is a jack, some jackstands, and knowing how to count helps too. The Ford 8. Part of the Z Design Studio project. Choosing the correct gear ratio is critical to maximizing performance, efficiency and drivability for any kind of vehicle operating under any conditions. You can try various combinations to come up with an appropriate combination of ring and pinion gear ratio and tire diameter for your vehicle. When stock parts just won’t cut it, G2 Axle & Gear has what you need to make your 4x4 faster, stronger and more reliable. Automotive Forums. 73's will probably drop feul mileage substantially, and if your 5. More Old Online Chevy Info WebCounter says that you are visitor number: to this site. Our Differential Gear Ratio Calculator can help you select the correct gear ratio to maximize the performance of your vehicle. Gear Ratio and Tire Size Calculator - 4x4 and Jeep Ring & Pinion When you change your tire size you need to make sure you have the right gearing to get optimal fuel economy and power. If the rear was originally anti-spin, the first letter will be an “X;” the second letter will be the axle ratio; and the following numbers represent the day of the year the axle was produced. New 2019 Chevrolet Silverado 1500 Work Truck Regular Cab Pickup for sale - only $34,913. This is usually known as the "final drive" gear ratio and unlike the transmission, is not usually "shift-able" (although you can disassemble the axle/transaxle and replace the gears). 8-inch axle has the same ring gear mounting distance (see Chapter 7) for all ratios, just like the 9-inch. R7 is a limited slip with a 4. 42 rear axle. Not all applications will have one of these codes but when they apply, they will be listed in addition to an axle code found in the main RPO axle code list below. According to Nasty Z28, the GM/Chevrolet 12-bolt rear end was manufactured from 1965 through 1971. My plans are to update to a 350 and 700r4 someday and figure I should look for the best ratio for the daily driver routine in this work truck for best gas mileage. The pinion diameter is 1. GM 12 bolt axles The ultimate Chevy rearend Hemmings Motor News from chevy 10 bolt rear end gear ratio chart , source:hemmings. They are an improvement on the S10 version of the T5, some of which had a 4. 55 gear ratios. If you are looking for help with restoring or hot rodding your chevy classic a good place to go for help is Chevy Talk my favorite forum is 1955-1957 ( Modified / pro street / show) forum. JEEP IDENTIFICATION NUMBER E K KK S T ss l-r 3241 253 3241 254 3241 255 3241 256 5200861 3. 2-inch ring gear and does not interchange.