Also just looking for a standard type rear end like an 8. I have a Coyote, 3. This chart applies to all Ford non-overdirve transmissions, manual and automatic. I would like to know what to expect (acceleration wise) when using a Muncie short ratio with a 3. Choose top quality brands Dorman, G2 Axle & Gear, Motive Gear, Richmond Gear. 26 gear with a 28" tire for my small block. What is the rest of your build like motor, trany, rear tires? Dave ----. 90s, giving you that extra oomph on the track while maintaining a tolerable cruising RPM on the street. This trans would put the ’46 just a tick over 2,000 rpm at 75 mph. Mark the inside of the tire with chalk for a reference point. 73 to one, and 4. The below table can be used to get a rough idea on gear ratios. 2013 FORD MUSTANG GT TECHNICAL SPECIFICATIONS DRIVETRAIN Layout Rear-wheel drive (limited -slip differential) TRANSMISSION Standard Six -speed manual with Hill Start Assist Gear ratios First 3. hypoid gear oil and reinstall the cotter pin securing the axle half shaft nut. During average use, the rear wheel horsepower required to drive a given car at highway speed is constant. The 2002 Ford Explorer has 120 problems reported for whining/roaring noise from rear differential. 375:1 gear, thats your difference in RPM. Ultimate Rear Axle Build: A Super-Strong 11. It will be used for highway driving and of course some around town use as well. The first step is to remove the differential from the axle housing. To find this number, we divide the tire circumference by the drive ratio. 73:1 gears at 4,400 rpm. It doesn't seem to be very good for highway driving though. So again, unlike the GM and Dana axles that require a unique differential with different ratios, the Ford 8. If you have a true 'locker" you would know because the rear end (or front end in some cases) will resemble the sound of a. A smaller engine will need a lower rear end to give adequate acceleration. Where can I find my rear end gear ratio? Highway driving mostly with no loads, 3. I am going to have to take it apart and clean it up anyway. Each gear produces a different number of revolutions. Plug in the tire size, speed, rpms, and other info - leaving out whatever you're trying to determine - and it will come up with your answer!!!! I used to build rat rods and depended on this website to tell me what gear ratio I needed for the tires I was going to use. This trans would put the ’46 just a tick over 2,000 rpm at 75 mph. Technically, the number should be expressed as a ratio, such as 3. 96:1 rear gear for the same final drive ratio. larger tires can bring your engine speeds down and make highway. Whats the best rear end gears for this set up. If you went the other way and changed the rear axle ratio, the engine would scream—4000 rpm at 75 mph with a 4. In medium-duty trucks, gear ratios range from as low as 2. Towing and Hauling. 8" gears, off-road ring and pinions, ring and pinion gear sets, master install kits, pinion kits, mini install kits, axles, ujoints, bearings, air lockers, triple drilled flange, diff housings, solid spacers and other Ford performance parts and accessories for your 8. (2 ton or heavier) I found a mid 70s Ford 800 truck that has a 4 speed transmission behind a straight six engine which has a single speed rear axle. Questions about the differential gear ratios and Toyota pickups commonly come up. It seems from all the conversations we have had about this, that 3. To the OP, Ford offers the 3. A more powerful engine can use a higher rear end to give relaxed cruising and a higher top speed. 55 gear ratio he recommended for his 33's will end up driving well or even close to it. Axle-wrap is amplified due to the Excursion suspension design. (Especially because I've been tolerating 3. Right after I bought it new, I changed the governor springs, put in a TST kit and bigger injectors, and it puts down 300+hp/700lb torque on a floor dyno. Carefully count the number of full revolutions the driveshaft makes. Looking for balance of power/gas mileage. About this Engine RPM / Tire Size chart: The following chart of Tire sizes and axle gear ratios are meant to give a general idea of the relationship between the differential gear ratio and the tire size and. Ford Garage Rear Axle Gear Ratios. With a stockish 5. AAM has developed a series of axle and driveshaft components to make it easier for the installer to perform a repair or a complete replacement job. I have a 69 sportroof with a FMX Auto 3 speed with a 300. Pinion and bull gear are a 9 on 41 ratio producing a 4. com FREE DELIVERY possible on eligible purchases. It is in the long legged unloaded high speed cruising where the mileage difference will be more apparent between the two ratios. 10 when I first started my rear end build. Mine has the 4. No matter what you install in your RC car or truck, when it comes to speed and run time it’s all about gearing. Hi all - we are considering purchase of '02-'04 4x4 Suburban and have concerns re: mileage. We've assembled a variety of manual gear ratio charts for General. The Ford F-150 was introduced in 1975. 15 13 X 55 4. 73 and 5spd, not less. 55 rear end with an O/D transmission. 31 if it were me and enjoy a little better mileage. * Drain the fluid (on models without a drain plug, use the fluid transfer pump to “suck” the fluid from the differential. Ian shows you how to find the effective gear ratio on your vehicle when you upgrade to bigger tires with this equation on a PowerNation Extra tech tip. 10s, then if you want highway rpms lower, then you could re-gear to 3. General Truck parts has been the prime source for thousands of new and remanufactured heavy duty and mid-sized truck parts. So, you’d get the same acceleration (thanks to the short first gear) but much friendlier highway cruising and economy, thanks to the tall rear gear … and the 700R4’s 0. 17:1, depending on the truck class, make and model, and rear-axle capacity. The gear ratio inside the rear differential might not seem like much, but changes can greatly impact the truck’s towing and hauling capabilities. 88:1 rear axle to a 4. For highway cruising and best fuel economy stay towards the yellow (2600 rpm), around town daily driving is color coded green (2800 rpm), and for better towing power or just more 4-low power use the ratios near the red (3100. Selecting a rearend gear ratio (ring & pinion set) to provide the desired highway cruising speed, 60—65 MPH, for a modern hot rod. The ratio is the number of teeth on the driven gear (ring) divided by the number of teeth on the drive gear (pinion). 73 to one, 3. 05 axle would be the same as 4th gear 3. The lockout on the transmission will lock out the final overdrive gear (which is greater than less that 1 which is why its called over drive) to keep the engine in the right RPM range. Higher gear ratios, such as 5. 88's on any tire size besides stock. The other option is to replace the trans with a 4 speed OD trans (700R4 or 2004R) and keep the 3. 1500 Model Rear Axle Mopar Synthetic Gear Lubricant SAE 75W-140 (MS-898 5). You'll run out of RPM and will need to shift to a higher gear. RPM - Rear End Ratio Chart: The chart below may be of some help in deciding what rear end ratio is right for you. 10 when I first started my rear end build. 55:1, meaning the drive shaft turns 3. How much do you plan on driving on the street, I have a similar setup,68 charger 440, 727, etc. Axle, Semi-Floating The inner shaft of this axle is carried on an extension of the differential; the outer or wheel bearings are carried directly on the axle shaft. The only problem with this would be that you will have lower torque when starting off in first. I lean towards 3:54 gears at 455hp. Mustang Rear Gear Ratios Overview. 0, a 3:73 is the minimum performance gear. My top 5 reasons why I chose a 3. 11 gears (37 ring gear teeth and 9 pinion teeth) but your rear axle has 4. 73 will be a good match for 8500 lbs. Tip: It's best to seek out the help of an experienced professional when changing the rearend gears. The other option is to replace the trans with a 4 speed OD trans (700R4 or 2004R) and keep the 3. Each issue is unique, so if in doubt call our differential repair experts for advice. Limited Slip Differential (also referred to as “posi” and LSD): Limited-slip differentials use the same spider-gear arrangement as an open carrier, but add a clutch pack, worm-gear arrangement or tapered cone setup to feed some power to the wheel with the least traction, regardless of road conditions. The gear change is quick and easy for less than $100 for gear sets. Hi all - we are considering purchase of '02-'04 4x4 Suburban and have concerns re: mileage. Gearing Ratios. Gearing Ratios. 0:1 LSD in Fairlanes and other medium performance cars, it's good enough to assume the ratio is fine for cruising and normal highway driving. 75 rotation for every full rotation of the cranks. 17:1, depending on the truck class, make and model, and rear-axle capacity. 70: 1 Rear Differential Type Electronic limited slip Availability Standard Ring Gear Diameter (in/mm) 9. Each issue is unique, so if in doubt call our differential repair experts for advice. Next, Dual Rear Wheel (DRW) F-350 and F-450's are bumped to a Dana M300 with a massive 11. for instance if your engine turns 2500rpm and you have a 1 to 1 high gear in transmission with a 4. The faster you go the louder it gets. I would not use an FMX transmission because they are way less efficient than a C4 and not any stronger IMHO. Note: Ford 10. Define differential gear. 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. 73 are going to drive you crazy. Learning what gear ratio is and how to calculate for it can help you build a high-performance car. What can I do OTHER than change the rear end gears to drive on the highway, like everything that I have read says that 4:11's suck on the highway, and you really want like 373 or 342's if the car is going to be going that far. My top 5 reasons why I chose a 3. GM/CHEVROLET FINAL DRIVE RATIOS. 10 ratio GU5 Rear axle, 3. 70 you might want to buy the overdrive because of the more aggressive 3. It is absolutely imperative that you refill the gear oil in your car's rear differential with the correct type of fluid. How to Determine Gear Ratio. Ford Garage Rear Axle Gear Ratios. It's going to come down to personal preference, but if you plan on making 1 hour drives down the highway, believe me rear axle ratios lower (numerically higher) than 3. 9 cummins mech. Those with a 5th gear near. The value will be returned in estimated differential gear ratio, based on the entered values. You may have to register before you can post: click the register link above to proceed. Pressing the "Reset" button loads the default values into the form. 23 to one, 3. 5 mpg i figure, i need advice on a ratio change to get around 70mph at a more comfortable rpm. Gear set has held up great, if it was going to break it would have by now. My top 5 reasons why I chose a 3. You could run a much lower rear end ratio (3. The only real gain that I see is,if it can be considered a positive, the shorter gear makes it easier to brake the rear tires loose. This is the strongest rear made by Mazda for your miata. 73 G2 Dana 44 Rear Ring Gear and Pinion Kit - 3. Having a locking rear differential in this. 50:1 is a popular ratio when you still want to do occasional highway driving. Street, race car, off road 4x4 and 2wd trucks. An updated differential clutch kit available. BUT if I really wanted to get on the highway from time to time how horrible would the cruising speed/gear shifting be with 3. This was a couple/few years ago, so I can't remember when model-year-wise the Outback part number transitioned. Red = Best Power, this will give you the best performance for towing power, but at the expense of your MPG. It is really helpful to learn more about gear ratios and how to change out the rear end ones. For example, aerodynamic drag from the truck's frontal area, weather conditions, and driving habits—not the gear ratio—are all major contributing factors in a vehicle's fuel economy. We offer a full line of new and remanufactured differentials, transmissions, and rear axle assemblies complete and ready to ship to you. It is absolutely imperative that you refill the gear oil in your car's rear differential with the correct type of fluid. Is this a good choice? I am going to get a rear axle next week and want to get the best gear. The t5 works best with the 3. I think in concept a 3. It will be used for highway driving and of course some around town use as well. There isn't any 3. In order to determine the overall gear ratio in overdrive, the math calls for multiplying the rear gear ratio by the overdrive ratio. 6 with a 4R70W will find 1st gear too low with. How: A number of factors must be considered when selecting a rearend gear ratio (ring & pinion set). 70:1 overdrive fourth gear and lock-up converter. 11 axle ratio, a 30-tooth over a 22-tooth QC ratio being 1. I don`t know whats in it now, I think its a 3. FBJ posted an answer but if you ever need to verify a rear end ratio it is easy to do. SUVs and other non-pickup tow rigs cannot escape scrutiny. All the trucks I'm looking at are at 455hp (a DD13 is at 400). Times and requirements have changed making both the M21 and M22 the closest ratio production 4 speeds ever produced but also not practical for today's driving habits unless road racing is your thing. C4 Auto Best Rear End Ratio? According to Mustang Steves FAQ section on rear ratio selection you need at least a 9:1 torque multiplication ratio for a good street performer and perhaps should take this into consideration as well as highway driving. A Guide to Mustang Rear Gears your top end speed and some fuel economy. 1 (mine) vs 4. The standard gears were 4. They are activated due to each tire turning at a different ratio or speed, A "locked" axle doesn't care, they (tires) turn at the same speed all the time. For example…a 4. Questions about the differential gear ratios and Toyota pickups commonly come up. Understanding your vehicle’s gear ratio is a powerful tool when making changes at the track or around the. Unfortunately, the parts database just showed parts numbers, it didn't show the actual ratios, so I don't know the ratio of the other, "mystery" Outback 5th gear. Each issue is unique, so if in doubt call our differential repair experts for advice. I have been noticing that my gears seam to be having a difficult time, and it is really affecting the performance of my car. I have a Coyote, 3. 70: 1 Rear Differential Type Electronic limited slip Availability Standard Ring Gear Diameter (in/mm) 9. If you've ever driven a C7Z, you'll notice that the gear spread is perfect, it just needs a slightly lower axle ratio. This also depends on the current rear gear. 10 gears compared to 3. What rear end and gear ratio will give me the best fuel mileage on the highway hauling 80,000 lbs - Answered by a verified Ford Mechanic We use cookies to give you the best possible experience on our website. For highway cruising and best fuel economy stay towards the yellow (2600 rpm), around town daily driving is color coded green (2800 rpm), and for better towing power or just more 4-low power use the ratios near the red (3100 rpm). Despite these attributes, many performance enthusiasts find the stock gearing to be lackluster at best, especially in racing and performance driving environments. Variable Rate Jounce Bumpers provide exceptional shock-reduction when. Motor to Wheel Gear Ratio and Motor Type Examples. Summit Racing offers ring and pinion gears in all of the ratios, diameters and spline counts you’re looking for to complete your build. Any change in rear gear ratios will also require a change in speedo gearing, if you want the speedo to read correctly. This means that the front sprocket is 2. Ford used mainly 4 different trans gear sets to obtain different low and second gear ratios. My best fried daily drives a 2010 GT500 with 4:10s in it. Classic Industries offers a wide selection of 1969 Chevrolet Camaro parts, including 1969 Chevrolet Camaro interior parts and soft trim, 1969 Chevrolet Camaro exterior sheet metal, 1969 Chevrolet Camaro moldings, 1969 Chevrolet Camaro emblems, 1969 Chevrolet Camaro weatherstrip and unique accessories, to nearly every nut and bolt needed for installation. Knowing the gear ratio of your F-150 is important if. I could have driven all day with the GTR in my rear view, what a car and the mods WOW!!!!!. The only real gain that I see is,if it can be considered a positive, the shorter gear makes it easier to brake the rear tires loose. With a ratio of 4. 370z Rear end Gear Ratio? I've seen alot of info on overall ratio wrt transmissions, but I am curious as to what the rear end ratio of the 370 limited slip differential setup is?. The colors represent ideal RPM's at highway speeds (65). I used to stick with 3:55s tops with a 14" tire and 3:73s tops with a 15", but I was not making any long highway runs. This also depends on the current rear gear. Considering making modifications to your Jeep? Whether it is changing an axle or going with different tires this chart is helpful in finding the right Tire Size to Gear Ratio that you need to achieve the optimal performance for your particular application. highway driving. 77 13 X 50 3. Higher gear ratios, such as 5. Dave: "The tag shows your axle's gear ratio. This is the strongest rear made by Mazda for your miata. 23 or below for optimal performance and lower cruising RPMs. There is an adjustment for pinion depth to set gear backlash and bearing preload using shims, but thsi is not for wear compensation, only for new setup. HiI was hoping to get some opinions from you all when it comes to Muncie transmissions and rear end gear ratios. 88 expecting to run 35's but ended up with 33's instead because of a deal he got or something. RANDYS has the widest aftermarket drivetrain selection. This chart applies to all Ford non-overdirve transmissions, manual and automatic. 55 rear end with an O/D transmission. 92's or the 66rfe with 4. 08 13 X 41 3. Any change in rear gear ratios will also require a change in speedo gearing, if you want the speedo to read correctly. Change the gear ratio in your car according to your comfort or performance preference. Here's some quick math on the Gear Vendors 0. I'm not sure what ratio rear end is in my '78. I then special ordered an economy car, specifying within the manufacturers options, engine size, rear end ratio, tire size (diameter), a 5-speed manual, etc. Eckler's Corvette has a wide selection of Corvette differential parts, and rear differentials. When larger tires are added, without changing to the proper gears, more power is needed to maintain the same level of highway performance. For highway cruising and best fuel economy stay towards the yellow (2600 rpm), around town daily driving is color coded green (2800 rpm), and for better towing power or just more 4-low power use the ratios near the red (3100. If you do a mix of both, go with the “standard” axle ratio offered by the manufacturer. Good meeting you too fella, definitely a tidy spot for breakfast in the new year. 55 electronic locking rear. Not much free way driving. Be careful with what gear you choose and keep your driving style in mind. 88 being the closest. Car is meant for the street , cruising around, driving to work on the highway, etc. This was a couple/few years ago, so I can't remember when model-year-wise the Outback part number transitioned. The center differential is manually lockable and this comes as a standard feature; in addition, you can also opt for the optional rear differential lock; 2. I found different opinions on where the power was, how it was calculated, and even preceived. Ryder trucks seem to favor 3:54 gears and the used Schnieder trucks seem to all have 2:64 gears. 10:1 axle gearing in 6th gear. Alright guys, i have a 1966 200ci mustang with a t5 (2. I've got an M20 behind a 450hp small block with a 3. This is an EZ to use and web based shift point calculator! This is sometimes gear shift drop calculator. 10 gear ratio. This resource is built. 95 first gear). Over the years, the F-150 came with an assortment of rear ends and gear ratios depending on engine size and options. The DTS Driveline Retail and Online Store carries a full line of Drivetrain Parts and Components from Dana, Spicer, Timken, Richmond Gear, Moser, Eaton, Auburn Gear, Yukon Gear & Axle, Precision Gear, and many more. If you can read the tag, post what it says, and we can tell you. The set up of a gear set can be accomplished by first measuring the carrier pinion. 56 rear end it was a chore to launch. Find Ring and Pinion Gears with 10 Ring Gear Bolts and GM 8. We've assembled a variety of manual gear ratio charts for General. The funny thing is the 8 speed's 1st gear x 3. If we have a 4. 5" 10-Bolt Ring & Pinion Gears - 3. 73 to one, 3. 73:1, this simply means that the drive shaft (which is connected directly to the pinion gear) is going to rotate 3. You can run more gear with a taller tire. 64 1st gear is ideal for a 3. I am getting ready to put a new GM 10 bolt rear end in my MCSS and I have come to a crossroad in determining whether or not to put in 3. A Guide to Mustang Rear Gears your top end speed and some fuel economy. 55 electronic locking rear. Driving it home at 55 did seem dangerous, 18 wheelers would fly up behind me and swerve to the other lane. One of the most common places where the hobbyist must grapple with gear ratios is the case of a lathe that uses change gears to cut various threads (as opposed to a lathe equipped with a quick change gear box). If it is to be installed in a GM axle equipped with an optional Eaton differential, it will also be necessary to purchase a new gear support case assembly, GM #6258336 or #6258340, depending upon gear ratio. Pressing the "Reset" button loads the default values into the form. Perfect For 2. But I would really like to put in a 3. There was a tag on it that had "322" on it. I have a 1983 Jeep CJ7 258 6 cyl, 4sp manual dana 30 front axle/amc 20 rear. 73 times for every one revolution of the wheel. The other option is to replace the trans with a 4 speed OD trans (700R4 or 2004R) and keep the 3. I am going to have to take it apart and clean it up anyway. Re: What rear gear ratio is good for highway??? To check the ratio, I jack up only 1 rear tire and have a friend spin it 20 times. In pickup trucks and truck-based SUVs, a transfer case is a large mechanism attached to the rear end of the transmission (see the photo). If your truck is a Limited (mine is also) without the rear locker then you should have 265/70/r16 tires stock, which is a 31" tire and 4. Rearend Gear ratio- what's the best????? better for street driving and some highway. When larger tires are added, without changing to the proper gears, more power is needed to maintain the same level of highway performance. 10 on your pick-up trucks for plowing snow? I have a 2005 Chevy 2500HD extended cab with 4. The final drive ratio is the ratio of the number of teeth on the ring gear to the number of teeth on the pinion gear, and it's stamped on the final drive unit near the driveshaft oil filler hole. For example 27 inch tires with a 3. As an example, Subaru vehicles may utilize a 90/10 torque split to send power from the front axle to the rear axle in an effort to navigate across extremely slippery surfaces without sliding around. Axle Ratios Transmission Codes Production Totals Price $ VIN Decoder · 1973 Body Styles Grille Styles Rear Styles Wheel Styles Special Models Sales Brochures Measurements Paint Color Codes Engine Data Axle Ratios Transmission Codes Production Totals Price $ VIN Decoder · 1974 Body Styles Grille Styles Rear Styles Special Models Sales Brochures. One of the best-selling vehicles of all time, there are more F-150 trucks on the road than any other brand. If it was good enough for Ford to use 3. I have a three speed transmission and I can now cruise at a easy 55-60 and second is still low enough to make it up a steep hill. 727:1 (5 A/T) and 3. Rotate the tire one full revolution for posis and lockers and 2 full revolutions for open diffs. Looking at the chassis, Wilson thinks Sterling’s standard frame is the best choice. My top 5 reasons why I chose a 3. 31 rear axle gear ratio accelerated from zero to 60 mph in 5. 23 to one, 3. Sounds like you have a highway crusier there. Listed are the expected RPM's at 60 MPH with a given rear end ratio and tire height. Gears, axles, locker, limited slip, kits, driveshafts, transfer cases and more. There is an inverse relationship between acceleration and top speed. Because different transmission gear ratios can greatly affect a drivetrain combination, it's important for anyone performing a transmission swap to know the gear ratios of the gearboxes you might be installing in your vehicle. Evolution, not revolution, is the name of the game, but the 70 Series has now become much more complex, Allan Whiting from Outback Travel Australia reports. HiI was hoping to get some opinions from you all when it comes to Muncie transmissions and rear end gear ratios. 56 gear online but I haven't checked the rear end myself. The DTS Driveline Retail and Online Store carries a full line of Drivetrain Parts and Components from Dana, Spicer, Timken, Richmond Gear, Moser, Eaton, Auburn Gear, Yukon Gear & Axle, Precision Gear, and many more. In addition, crawl speed is decreased. The actual difference between a 4. Parts ship same day!. 31 axle ratio, the driveshaft turns 3 1/3rd times for every revolution of the rear wheel. That dimension is 62-1/4" up to 64-3/4". 12:1 rear axle, your RPMS would have went up at highway speeds. What factory rear gear ratios were offered for this truck and does this rear end have a specific name? It has a 307 w/th350 transmission. i have the 2. 55 and keep it strictly track. Reassembly should be straightforward, but don’t forget to bleed the brakes, replenish the rear axle assembly with 90 wt. A new Selec-Trac 2-speed transfer case with full-time 4-wheel-drive mode. Many fleets out there are running this gearing setup with 10-speed direct transmissions. Summit Racing offers ring and pinion gears in all of the ratios, diameters and spline counts you’re looking for to complete your build. Note: Ford 10. Always wear your safety belt and deactivate passenger airbag when using a rear-facing infant safety seat Passive Anti-Theft System (SecuriLock TM ) Anti-lock brake system (ABS). Ford F-150 owners have reported 77 problems related to differential unit (under the power train category). 14 (direct~~ drive in the new 6spd Torqshift) is equal to a 3. In pickup trucks and truck-based SUVs, a transfer case is a large mechanism attached to the rear end of the transmission (see the photo). This chart applies to all Ford non-overdirve transmissions, manual and automatic. 0:1 LSD in Fairlanes and other medium performance cars, it's good enough to assume the ratio is fine for cruising and normal highway driving. Another significant change is the loss of power off the line. For example, the first gear on an AX-15 transmission has a gear ratio of 3. Face and head injuries – airbags. GM states their is only a 1 mpg difference. The owners manual has this listed. 1 x 267-125 – Roll Pin. Re: What rear gear ratio is good for highway??? To check the ratio, I jack up only 1 rear tire and have a friend spin it 20 times. Right now same rear and trany (TH400) and stall behind a 360 280H cam it runs 13. transmission accomplishes this task by providing a variety of gear ratios between the engine crankshaft and the output axle of the vehicle. 5:1 will make the engine very busy at highway speed, anything less will slow launch capability. Diff Ratio Now that the circumferance of the wheels is known, and the ratios between the engine and road wheels, you can calculate the road speed for any RPM in a given gear Select your gear. 00:1, at least in the 1968-1974 Javelins and AMXs, I don't know if they were available in the Rebel Machine, Hornet SC/360 or any other line. 90 rear end gear. EPA rated mileage for the stock engine with 4. I can only assume GM thought the diesel ¾-ton models would be primarily used for towing. 1997 Chevy Tahoe, with a front carrier with a 3. I still have one for a shop truck and drove it last weekend, avg. 73 if fuel economy is the primary concern. I have a three speed transmission and I can now cruise at a easy 55-60 and second is still low enough to make it up a steep hill. The axleshafts pressed against the differential’s carrier pinion gear shaft, creating a pivot point for the rear suspension. My older brother ran that ratio in a 69 Mach 1 with a 351W and FMX trans way back in high school. Cost: $250-$300. When working on a DANA unit, you can get the seals from Jaguar, bearings from a local bearing house, and the clutches, shims, and those silly little clutch retainers from any performance shop that has access to Dana rear end parts. It is a weekend car, go to shows and car meets for the most part. Ram Owner Files Class-Action Suit for Wrong Gears.