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How To Change Mustang Differential Fluid

Need to change your Mustang's gear oil? Follow along as LMR walks you through how to drain and refill your Mustang's differential!

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How To Change Mustang Gear Oil

Changing your Mustang's rear end gear oil is one of the most overlooked maintenance jobs. Even though it may seem intimidating, the process is quite simple. Follow along as we walk you through how to change your Mustang's gear oil.

Tools Required:

  • Socket Set
  • Flat Head Screwdriver
  • Drain Pan
  • Gasket Scraper
  • Brake Clean (Optional)

Installation Instructions

  1. Lift your Mustang with either a jack and jackstands or with a lift.

  2. Ford Mustang Gear Oil Change Install

  3. Place a bucket or drain pan under your rear end, and loosen and remove all but the top cover bolts.

  4. Ford Mustang Gear Oil Change Install

  5. Using a flat head screwdriver, pry the cover open and allow the fluid to drain into the drain pan.

  6. Ford Mustang Gear Oil Change Install

  7. Once the oil has slowed to a drip, loosen and remove the top bolt, remove the cover and set aside.

  8. Ford Mustang Gear Oil Change Install

  9. Scrape off any remaining gasket and clean the differential with brake clean. Do the same with the cover as well.

  10. Ford Mustang Gear Oil Change Install

  11. Install either a lube locker gasket or quality gasket maker on the mating surfaces.

  12. Ford Mustang Gear Oil Change Install

  13. Reinstall the cover and torque down the bolts to 25 lb-ft to the differential in a star pattern.

  14. Ford Mustang Gear Oil Change Install

  15. Locate and remove the drain plug with the correct drive/socket.

  16. Ford Mustang Gear Oil Change Install

  17. Using a fluid transfer pump or simply squeezing the fluid into a rubber hose inserted into the differential, fill the differential with the correct amount of fluid.

  18. Ford Mustang Gear Oil Change Install


For proper fluid capacities, check out our Mustang Fluid Capacities Charts

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About the Video

How To Change Mustang Rear End Gear Oil - LMR Basics

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 2016-12-02
In this installment of LMR Basics, check out the simple steps required to change the rear end gear oil in your Mustang.

Whether you're changing rear end gears or doing routine maintenance, this video will show you the general procedure on changing the rear end oil in your Mustang.

Shop LMR.com for the best selection of rear end parts for your Mustang.

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Transcript
What’s up everybody! Landan with Late Model Restoration. In this installment of LMR Basics, I’m going to be bleeding the brakes on this 1992 Fox Coupe.

Every once in a while the rear end in your Mustang needs servicing. It plays a vital role in vehicle performance because after all its job is to transfer power from the engine to the rear wheels. This task is very simple, and often overlooked by many because of the intimidations from rear end components.

Before changing the rear end gear oil in your Mustang you are going to need a few supplies to get the job done. You will need a lift or jack and jack stands, a socket set, flat head screwdriver quality brake clean, rags or shop towels, a putty knife or gasket scraper, a quality liquid gasket product or one of our Lube Locker reusable gaskets, a drain bucket, the correct rear end gear oil weight and friction modifier, and lastly; a clear tube to transfer the fresh gear oil into the housing. The alternative to this is to purchase a transfer pump from your local auto parts store.

To begin, support the vehicle via a lift or jack stands. Position the drain pan underneath the rear end housing. Loosen and remove all of the cover bolts except for the top one. Leave this tight and in place so you can pry on the cover.

Now, use a flat head screwdriver to pry open the cover so the old fluid can drain out. Once the majority of the fluid has ran out, loosen and remove the top bolt. Finally, remove the cover and set it aside.

Use this time to scrape away any old gasket maker and thoroughly clean the rear end with quality brake clean. Rotate the carrier to ensure all surfaces are clean. Do the same for the differential cover.

Once complete, scuff the rear end housing surface and diff cover with a Scotch-brite pad to further clean the mating surfaces. I used a Lube Locker gasket from our site, LMR.com to ensure a proper seal between the cover and housing. Option two would be to use a quality gasket maker and apply a thin bead around the differential cover.

Reinstall the cover and then torque the bolts to twenty to twenty-five pound feet, working in a star pattern.

Now, remove the fill plug with a three eights ratchet and three inch extension. Use some clear tube to fill the rear end or the transfer pump. I personally squeeze a little fluid in and then make a hole in the bottle to pressure it with an air gun. It’s one of those things, if it works, then stick with it.

Make sure and use the correct gear oil and the right amount of gear oil. Pretty much all eight point eight rear ends take right at two quarts of gear oil.

Once the rear end is filled, tighten the fill plug and then double check your work. That completes a successful rear end gear oil change.

As far as a time frame goes, if you take your time you can probably bet on about an hour and a half to two hours. A couple things to keep in mind when you changing gear oil; this is a great time to replace axle bearings and seals, rear end gears, and service the carrier if needed. For the correct rear end gear oil change interval, be sure and reference your owner’s manual.

Until next time guys, subscribe to our YouTube channel if you haven’t already done so; be sure and check out our wide selection of rear end parts and accessories for your Mustang from the real Mustang enthusiasts, LMR.com!