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rear differential fluid change

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paradigm

Member
Joined
Apr 21, 2025
Messages
39
Looking to change the differential fluid on the rear end of my 87 GN. Which fluid and gasket are you guys going with (Fel-Pro RDS 55028-1 )? What is the capacity? 2 quarts and fill till it starts coming out of the fill hole? Any other tips?


rearunderbodypaint.jpg
 
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I used the Felpro gasket on mine. I don't remember the part number was but bought it off Rockauto for the 8.5 rear. I only use dinosaur rear lube - not synthetic. I used 3 bottles of Lucas 80w-90. I also put in the GM posi additive since I still have the original posi unit in the rearend. I fill it till it won't take any more in the fill plug. Go to GNTTYPE.org. The spring cleaning section discusses changing the rearend fluid. Pretty simple.

Craig
 
hello peoples: While your doing this I went 4 some chrome bolts (I think from summit) U can't c em much but that's what I did. I kept the stock cover as I like the magnet that's on it.
IBBY
 
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