Ford Mustang Rear End Gears Installation Instructions

Posted 6/23/2017 by Tyler Rodriquez

Follow along as Jmac from LMR.com shows us how he would go about installing new rear end gears!

FOLLOW: mustang , ford racing , ford performance , how to , install , installation , rear end , rear end gear , ring and pinion

Installing gears on a Mustang

If you're like a lot of other people out there, you've probably wondered at some point in time whether or not you're capable of installing rear gears in your Mustang. Well, there's no clear-cut answer to that. You will need above-average mechanical capabilities along with some specialized tools.

Tools Needed:

  • Bearing & Seal Driver Set
  • Two-Jaw Puller
  • Beam-Type Inch-Pound Torque Wrench
  • Couple of Large High Quality Drifts
  • Mag Base & Dial Indicator
  • Pinion Flange Holding Tool
  • Pinion Depth Checking Tool (Optional)
  • Digital or Dial Caliber (Optional)
  • Slide Hammer
  • Axle Bearing Attachment
  • Hydraulic Press
  • Press Plates
  • Bearing Separator
  • Common Hand Tools
  • Gear Oil
  • Friction Modifier
  • Lift

Installation Instructions

  1. Lift and support your Mustang, and remove the rear wheels. If equipped with drum brakes, remove the drums. If equipped with disc brake, take loose the caliper, remove the caliper, remove the pads, caliper brackets, and rotors. Then remove the ABS sensors.


  2. Ford Mustang Rear End Gears Install Ford Mustang Rear End Gears Install

  3. Remove the 10 differential cover bolts, drain the oil, and remove the cover. Remove the carrier cross pin bolt and then the cross pin.


  4. Ford Mustang Rear End Gears Install

  5. Doing one at a time, push in an axle and remove the C-clip. Slide the axle out of the housing.


  6. Ford Mustang Rear End Gears Install

  7. Noting the orientation of the main bearing caps, mark each cap if it will help you.


  8. Ford Mustang Rear End Gears Install

  9. Remove the two bolts per side and set the caps, keeping them in order, be it right-hand or left-hand. Carefully pull out the differential and keep the shims located in the right-hand or left-hand position.


  10. Ford Mustang Rear End Gears Install

  11. Mark your drive shaft and pinion flange. Remove the drive shaft bolts. Then remove the drive shaft or tie it up out of the way.


  12. Ford Mustang Rear End Gears Install

  13. Using the flange holder tool, remove the pinion nut. Use a two-jaw puller to free the flange from the pinion. Remove the pinion from the housing.


  14. Ford Mustang Rear End Gears Install

  15. Pry out the old pinion seal as well as the outer pinion bearing and oil slinger. Using a hammer and a drift, remove the inner and outer pinion bearing races. Take an opportunity to remove any remaining oil from the rear axle housing. Using a hammer and the race driver, install the new inner and outer pinion bearing races.


  16. Ford Mustang Rear End Gears Install Ford Mustang Rear End Gears Install

  17. This is a great opportunity to replace your axle bearings and seals. Using a slide hammer and axle bearing attachment, remove the old bearings and seals. You can rent these tools at your local parts store


  18. Ford Mustang Rear End Gears Install

  19. Using a bearing and seal driver, install the new axle bearings fully seated in the housing, followed by the seals. But the seals just need to be flush with the housing, not fully seated.


  20. Ford Mustang Rear End Gears Install

  21. Clean off the new pinion bearing races with Brakleen and wipe them down with fresh gear oil. Take your new outer pinion bearing, and coat it thoroughly with fresh gear oil. Then slide it into place, followed by the oil slinger.


  22. Ford Mustang Rear End Gears Install

  23. Tap the new pinion seal into place. Using a bearing separator and the hydraulic press, remove the old inner pinion bearing from the old pinion and remove the pinion shim.


  24. Ford Mustang Rear End Gears Install

  25. Clean it up, and slide it on to the new pinion. Again using the hydraulic press, install the new inner pinion bearing onto the pinion.


  26. Ford Mustang Rear End Gears Install

  27. Thoroughly coat the inner bearing with fresh gear oil. Slide one of the new crush sleeves onto the pinion, and slide the pinion in to the axle housing.


  28. Ford Mustang Rear End Gears Install

  29. Thoroughly coat the inner bearing with fresh gear oil. Slide one of the new crush sleeves onto the pinion, and slide the pinion in to the axle housing.


  30. Ford Mustang Rear End Gears Install

  31. An impact will only get you so far. Some good, old-fashioned muscle is needed to crush the new crush sleeve. The combination of the flange holding tool and a couple of 1/2-inch breaker bars get the job done for me


  32. Ford Mustang Rear End Gears Install

  33. Check the tension of the pinion flange often as you're tightening as you don't want to over-tighten. Using a beam-type inch-pound torque wrench, you're trying to achieve 8 to 14 pounds per inch rotational resistance with used bearings or 16 to 28 pounds per inch of rotational resistance with brand new bearings. As with a lot of things, you simply find what works for you and stick with it.


  34. Ford Mustang Rear End Gears Install

  35. I take a cut-off wheel and remove the cage and rollers from the carrier bearings. Then I use a combination of a block off plate and a two-jaw puller to remove the remainder of the carrier bearings.


  36. Ford Mustang Rear End Gears Install

  37. Remove the ten ring gear bolts, and either tap or press off the older ring gear. Use the hydraulic press to install the new carrier bearings. Slide the new ring gear onto the carrier, and start a couple of new ring gear bolts to pull it on slightly. Loosely install the rest of the bolts.


  38. Ford Mustang Rear End Gears Install

  39. Snug them up in pattern, and torque them in two stages, first to 35 pound feet and then, final torque, to 97 to 102 pound feet. Thoroughly coat the new carrier bearings with fresh gear oil.


  40. Ford Mustang Rear End Gears Install

  41. Grab the new races. Clean with Brakleen, and coat with gear oil. Position them on the carrier bearings along with the old carrier shims in the same orientation they came out, and reinstall the two bearing caps.


  42. Ford Mustang Rear End Gears Install

  43. Tighten and torque the cap bolts to 90 to 100 pound feet. Using a mag base and a dial indicator, check your, backlash. You are shooting for 0.008 to 0.012. Finally, check the tooth pattern with the supplied marking compound.


  44. Ford Mustang Rear End Gears Install

  45. Use the illustrations of acceptable patterns in the FRPP instructions to make sure your gear set installation passes. Finally, slide your axles back into place.


  46. Ford Mustang Rear End Gears Install

  47. Clean the cover and the housing. And reinstall the cover using one of our optional reusable cover gaskets. Fill the axle housing with new oil and friction modifier, and completely finish resembling the car.


  48. Ford Mustang Rear End Gears Install

  49. At this point, you'll want to correct your speedometer by using a new speedo gear, a speed calibrator adjuster, or programmer tuner, depending on your year model. Once the car is back on the ground and the wheels are torque, take a test drive. And drive responsibly for a couple of hundred miles, so the gears can set a wear pattern. And that concludes a successful rear gear installation that required no adjustments.


  50. Ford Mustang Rear End Gears Install

    If you're replacing factory-installed gears with Ford racing gears, you should end up just as lucky. However, there are exceptions to every rule. That's where some of these other specialty tools will come into play, like the pinion depth checking tool. It comes with its own set of instructions on how to use it to get the correct measurement to select the right pinion shim.
    If your marking compound shows a pattern that indicates the pinion is too close to the carrier or too far away, you'll want to pull this out, along with your caliper, measure out, select your new pinion shim, and start by rechecking your backlash. If your backlash is out of whack-- let's say it's too tight-- then that means, when you're looking at the back of the rear end, you're going to want to move the carrier from the right to the left to give yourself a little bit larger backlash reading. If it's too lose, than it needs to move from the left to the right to tighten it up. You want to take your caliper and measure your existing carrier shims and then use the selected shims provided in the install kit to transfer some of your shim thickness from one side to the other. A quick look at the Ford racing instructions will show you how much of a thickness change will impact your backlash readings.


Mustang Gears & Rear End Gear Kits

These Ford Racing & Yukon gear kits are offered in 3.08, 3.15, 3.27, 3.31, 3.55, 3.73, 4.10, and 4.30 for your 7.5" and 8.8" rear ends. Pick them up with a new rear differential gasket, gear install kit, gear oil, friction modifier, and everything else needed to complete your installation. These Mustang Gears Fit:... more

Mustang Speedometer Gear Calculator

Mustang Speedometer Gear Calculator Transmission Manual Automatic ... more

Mustang SCT Tuner

Maximize your 1996 to 2015 Ford Mustang's performance with an SCT tuner! SCT offers many different variations of Mustang tuner devices like the X4 (7015), Livewire (5015) and the iTSX Flash (4015) to get the most performance out of your 1996-2015 Ford Mustang. Proven to be one of the best handheld tuners on the marke... more

Mustang Traction-Lok / Differential

Tired of the one wheel peel? Well Latemodel Restoration Supply has the Mustang traction lock differential to fit your needs. If you are wanting to upgrade your v6 mustang, Mustang GT, or Mustang Cobra LRS offers brand like Eaton and Ford racing to get the job done! more


About the Video

Mustang Rear End Gear Installation: Ford Racing 8.8 Ring & Pinion

Check out our YouTube channel for even more tech tips, installation videos, how-tos, and more. The best place to go for anything Mustang related!

Published on 2013-11-05
See our full line of Mustang Rear End Gears here: http://www.latemodelrestoration.com/products/Mustang-Rear-End-Gears

Are you looking to improve your ET's? Nothing improves your acceleration and helps you launch your Stang like a set of Ford Racing Rear End Gears! The FRPP ring and pinion gear sets are available in multiple gear ratios for your Ford 8.8 rear end. Each gear set includes the pinion and ring gears, crush sleeve and pinion nut. Here at LatemodelRestoration.com we know that you need more than just the gears to finish off your installation. That is why we are the originators of the Mustang Rear Gear Kits!

Each of our Gear Kits features all the needed parts for you properly install a new set of gears in your Mustang! We include only the best components in each kit. They begin with your choice of Ford Racing Rear End Gears (see below of available ratios) and then we throw in Ford Motorcraft Friction Modifier, Royal Purple Max Gear 75W-90 gear oil and finish it off with a master bearing & shim kit.

Installation of your new ring and pinion gears should always be done by a mechanic with a good working knowledge of rear end gears! We put together this how to installation video to help walk you through the install process. If you feel at any point this removal and installation process is above your mechanical skill level -- you aren't alone. Make sure you take your Mustang and new gears to a good trustworthy shop with experience installing Ford 8.8 rear end gears. This video will help you have a better understanding of what questions you should be asking and what to look for in the installation!

Changing your rear end gear ratio will require you to recalibrate your speedometer. For 83-95 Fox Body and SN95 Mustangs, you will need to replace your speedometer gear to fix your speedometer. Click the following link to see our speedometer gear calculator to properly select the correct speedometer gear - http://www.latemodelrestoration.com/products/Mustang-Speedometer-Gear-Calculator . If you have a 1996 to present Mustang your best fix is to pick up a SCT tuning device such as the SF3 handheld tuner to correct your speedometer. You can see our full line of SCT Tuners and Tech Videos here - http://www.latemodelrestoration.com/products/Mustang-SCT-Tuners .

When replacing the ring and pinion gears on your Mustang don't forget to pick up a traction lok clutch repair kit or new traction lock differential. The clutches in the factory unit wear out over time -- especially with aggressive driving. Save yourself time and money by replacing these when installing new rear end gears!!!! See our full line of Mustang Traction Lock Differentials and Repair Parts here - http://www.latemodelrestoration.com/products/Mustang-Traction-Lock-Differentials

Popular Gear Ratios:
3.08
3.15
3.27
3.31
3.55
3.73
4.10
4.56
Transcript
If you're like a lot of other people out there, you've probably wondered at some point in time whether or not you're capable of installing rear gears in your Mustang. Well, there's no clear-cut answer to that. You will need above-average mechanical capabilities along with some specialized tools. All I can do here is show you how I go about the process and the tools that I use to get the job done.

You'll want to have on hand a bearing and seal driver set-- this will help you squarely and safely install pretty much any bearing or sealed that you come across-- a two-jaw puller to help remove not only the pinion flange but a couple of the bearings as well. You'll need a beam-type inch-pound torque wrench to check the rotational resistance of the pinion bearing once you've tightened down the pinion nut and crushed the new crush sleeve, a couple of large, high quality drifts to drive out old bearing races, a mag base and dial indicator to check your backlash, a pinion flange holding tool. This will help you keep the pinion flange from rotating whenever you're removing the nut and tightening up the new nut and crushing the sleeve. You can buy a tool that's specifically made for this purpose, or you can make your own. Either way, you're going to want to make sure that it can accept a 1/2-inch drive breakover bar.

And a couple of things I hope you don't need are a pinion depth checking tool and a caliber, be it digital or dial. If you're going to be replacing your axle bearings and seals, you'll want to swing by your local parts store and go ahead and rent you a slide hammer and an axle bearing attachment. Finally, a hydraulic press is going to make your life a whole lot easier, along with a good set of press plates and a bearing separator.

Along with the specialty tools, you're going to want to make sure and have a nice collection of common hand tools along with the stack of new parts, most namely a new set of Ford racing gears for your 8.8, along with an install kit and some axle bearings and seals, if you want to make sure that those are replaced, some quality gear oil and some friction modifier. A couple of things you may want to think about is a reusable cover gasket and, if your Mustang has some miles on it, one of these seal savers. That way you don't end up with a leaky pinion seal. From our website, latemodelrestoration.com, you can download and print the Ford racing instructions for this gear install. That gives you step by step written instructions along with all of your measurements and torque specs for the install.

Lift and support your Mustang and remove the rear wheels. If equipped with drum brakes, remove the drums. If equipped with disc brakes, take loose the caliper, remove the pads, caliper brackets, and rotors. Then remove the ABS sensors.

Remove the 10 differential cover bolts, drain the oil, and remove the cover. Remove the carrier cross pin bolt and then the cross pin. Doing one at a time, push in an axle and remove the C-clip. Slide the axle out of the housing.

Noting the orientation of the main bearing caps, mark each cap if it will help you. Remove the two bolts per side and set the caps, keeping them in order, be it right-hand or left-hand. Carefully pull out the differential and keep the shims located in the right-hand or left-hand position.

Mark your drive shaft and pinion flange. Remove the drive shaft bolts. Then remove the drive shaft or tie it up out of the way.

Using the flange holder tool, remove the pinion nut. Use a two-jaw puller to free the flange from the pinion. Remove the pinion from the housing.

Pry out the old pinion seal as well as the outer pinion bearing and oil slinger. Using a hammer and a drift, remove the inner and outer pinion bearing races. Take an opportunity to remove any remaining oil from the rear axle housing. Using a hammer and the race driver, install the new inner and outer pinion bearing races.

This is a great opportunity to replace your axle bearings and seals. Using a slide hammer and axle bearing attachment, remove the old bearings and seals. You can rent these tools at your local parts store. Using a bearing and seal driver, install the new axle bearings fully seated in the housing, followed by the seals. But the seals just need to be flush with the housing, not fully seated.

Clean off the new pinion bearing races with Brakleen and wipe them down with fresh gear oil. Take your new outer pinion bearing, and coat it thoroughly with fresh gear oil. Then slide it into place, followed by the oil slinger. And finally, tap the new pinion seal into place.

Using a bearing separator and the hydraulic press, remove the old inner pinion bearing from the old pinion and remove the pinion shim. Clean it up, and slide it on to the new pinion. Again using the hydraulic press, install the new inner pinion bearing onto the pinion. Thoroughly coat the inner bearing with fresh gear oil. Slide one of the new crush sleeves onto the pinion, and slide the pinion in to the axle housing.

Inspect your pinion flange. If a groove is present on the seal surface, either replace the flange or use one of the seal saver sleeves to repair your old flange. Slide the flange onto the pinion, and install the new pinion nut. An impact will only get you so far. Some good, old-fashioned muscle is needed to crush the new crush sleeve.

The combination of the flange holding tool and a couple of 1/2-inch breaker bars get the job done for me. Check the tension of the pinion flange often as you're tightening as you don't want to over-tighten. Using a beam-type inch-pound torque wrench, you're trying to achieve 8 to 14 pounds per inch rotational resistance with used bearings or 16 to 28 pounds per inch of rotational resistance with brand new bearings. As with a lot of things, you simply find what works for you and stick with it.

I take a cut-off wheel and remove the cage and rollers from the carrier bearings. Then I use a combination of a block off plate and a two-jaw puller to remove the remainder of the carrier bearings. Remove the ten ring gear bolts, and either tap or press off the older ring gear.

Use the hydraulic press to install the new carrier bearings. Slide the new ring gear onto the carrier, and start a couple of new ring gear bolts to pull it on slightly. Loosely install the rest of the bolts. And snug them up in pattern, and torque them in two stages, first to 35 pound feet and then, final torque, to 97 to 102 pound feet.

Thoroughly coat the new carrier bearings with fresh gear oil. Grab the new races. Clean with Brakleen, and coat with gear oil. Position them on the carrier bearings along with the old carrier shims in the same orientation they came out, and reinstall the two bearing caps. Tighten and torque the cap bolts to 90 to 100 pound feet.

Using a mag base and a dial indicator, check your, backlash. You are shooting for 0.008 to 0.012. Finally, check the tooth pattern with the supplied marking compound. Use the illustrations of acceptable patterns in the FRPP instructions to make sure your gear set installation passes.

Finally, slide your axles back into place. Clean the cover and the housing. And reinstall the cover using one of our optional reusable cover gaskets. Fill the axle housing with new oil and friction modifier, and completely finish resembling the car.

At this point, you'll want to correct your speedometer by using a new speedo gear, a speed calibrator adjuster, or programmer tuner, depending on your year model. Once the car is back on the ground and the wheels are torque, take a test drive. And drive responsibly for a couple of hundred miles, so the gears can set a wear pattern. And that concludes a successful rear gear installation that required no adjustments.

If you're replacing factory-installed gears with Ford racing gears, you should end up just as lucky. However, there are exceptions to every rule. That's where some of these other specialty tools will come into play, like the pinion depth checking tool. It comes with its own set of instructions on how to use it to get the correct measurement to select the right pinion shim.

If your marking compound shows a pattern that indicates the pinion is too close to the carrier or too far away, you'll want to pull this out, along with your caliper, measure out, select your new pinion shim, and start by rechecking your backlash. If your backlash is out of whack-- let's say it's too tight-- then that means, when you're looking at the back of the rear end, you're going to want to move the carrier from the right to the left to give yourself a little bit larger backlash reading. If it's too lose, than it needs to move from the left to the right to tighten it up. You want to take your caliper and measure your existing carrier shims and then use the selected shims provided in the install kit to transfer some of your shim thickness from one side to the other. A quick look at the Ford racing instructions will show you how much of a thickness change will impact your backlash readings.

Also, common sense comes into play as you'll want to make sure and clean everything thoroughly throughout the process and definitely make sure it's all clean before you go back together. That way you don't have to worry about any problems down the road. I also like to keep around some old bearing casings and races for installing the new bearings. This will help you make your installation of a little bit smoother and a little bit quicker.

If you want more in-depth information about our gear kits and you're not viewing this on our website, be sure to click the link below to gather all that information. Also, check out latemodelrestoration.com for more driveline modifications and installations for your Mustang.