Differential Gear Oil Fluid Check
- Appropriate 3/8 ratchet, socket or wrench
- Gear oil
- Shop towels
- Protective eyewear and gloves
Start with the vehicle on level ground, safely lifted to access the differential fill port, use jack stands to support the vehicle.
Step 1 - Locate the gear oil fill port on the differential housing or rear cover.
Gear Oil Fill Port
Remove Gear Oil Fill Plug Step 3 - After the plug has been removed, insert a finger or wire into the fill port.
Insert Gear Oil Level Checker Step 4 - While inserted the indicator will leave a gear oil trace when removed. (Note: do not turn drive shaft or rear wheels while checking the gear oil level.)
Level Indicator Inserted Step 5 - When removed the indicator will show gear oil or not. If gear oil is not shown, the fluid is low and additional fluid is needed.
Gear Oil Indicator Step 6 - Using the appropriate gear oil, add to the differential until gear oil seeps from the fill port.
Adding Gear Oil Step 7 - Gear oil will seep from the oil fill port once the gear oil level is sufficient.
Gear Oil Full Step 8 - After the differential has been filled, recheck the level with an indicator.
Full Gear Oil Indicator Step 9 - Then, reinstall the oil fill plug and tighten.
Reinstall Oil Fill Plug Step 10 - Once the oil fill plug is tight, clean excess gear oil from differential using a shop towel.
Clean Excess Gear Oil
Helpful Information When after checking a differential fluid level, inspect the unit for leaks such as a rear axle seal. Always maintenance a differential and service the gear oil on a regular basis to ensure continuous operation. Knowing how a differential works also aids in troubleshooting noise related problems. Best Practices
- Use quality gear lubricants
- Use manufacturer recommended fluid and additives
- Inspect the differential for leaks shortly after adding gear oil