- Socket and ratchet set
- Gasket scraper
- Screw driver
- Differential cover gasket
- Gear oil
- Shop towels
- Safety eyewear and gloves
Draining Differential Fluid (Gear Oil) Step 3 - Continue this operation until the stream of gear oil has stopped, then remove the remaining three cover bolts while holding the cover in place. Once the bolts have been removed allow the cover to fall away from the housing to expose the inner workings.
Removing the Differential Cover Step 4 - Once removed clean the cover by scraping the gasket from the cover surface, also wipe out the cover while cleaning the particle magnet.
Metal Shaving in Differential Step 5 - Next, clean the differential housing gaskets surface with a gasket scraper, this will assure a proper seal when the cover is reinstalled.
Removing Differential Cover Gasket Step 6 - Once all cleaning processes have been completed its time to reinstall the cover with a new gasket, install sealer to the cover surface. (Note: apply sealer to the inside of the bolts holes to prevent leakage.)
Installing Differential Cover Gasket Step 7 - Once the gasket has been installed, reinstall the cover onto the differential housing and reinstall the mounting bolts and tighten in a star pattern.
Reinstalling Differential Cover Step 8 - Next, locate and remove the differential fill port which is located near or on the pinion snout. Once the plug has been removed fill the differential with manufacturers recommended fluid.
Refilling Differential Through Fill Port To check the fluid level use your finger and dip the fluid side of the differential and continue and do so until the fluid is at the top of the drain plug hole or until fluid is dripping out, reinstall the plug. The differential fluid change is now complete. (caution: never turn driveshaft or wheels when checking fluid to prevent injury.) Helpful Information A differential unit is used to transfer energy delivered from the transmission to the rear axles and then onto the wheels. Inside the differential there is a pinion gear, ring gear and spider gears. These gears are lubricated by 90 weight gear oil which loses its viscosity much like engine oil and must be changed. Though the differential does not have a filter, most utilize a magnet located inside the cover housing which is designed to trap any loose metal debris that may be suspended in the gear oil. Most service intervals are between 65,000 and 95,000 miles depending on usage. Best Practices
- Once the vehicle has been sitting for a while double check the cover plate for leaks
- Posi-traction or limited slip differentials use a special fluid that must be installed or malfunction will occur
- Never turn axles or wheels when checking the fluid level. Internal gears can be sharp which can cause injury