How To Change Rear Diff Oil 2005 Sierra 1500 GMT800 | 1999-2007 Silverado Avalanche Tahoe Yukon
How to Change Rear Differential Fluid on a 2005 GMC Sierra 1500 (GMT800)
In this video, I show you how to change the rear differential fluid on a 2005 GMC Sierra 1500 with a 10-bolt rear differential. This process applies to other GMT800 vehicles, including the Silverado, Avalanche, Tahoe, and Yukon.
What You’ll Learn:
How to identify the 10-bolt rear differential and locate the fill and drain plugs (not all units will have a drain plug).
Tools needed: 13mm wrench, 3/8-inch drive, gasket scraper, and replacement gasket.
Proper technique for draining, cleaning, and refilling with AC Delco synthetic gear oil.
Key Tips:
Check the RPO code in your glove box for "G80" to confirm fluid compatibility.
Avoid overtightening bolts to prevent damage to the housing.
Ensure the fluid level is below the fill line to avoid aeration.
By maintaining your rear differential, you ensure long-lasting performance and reliability. Drop your questions or tips in the comments below, and don’t forget to like and subscribe for more maintenance videos!