Hey boys,

Noticed the rear differential was leaking on the truck last week so this weekend I got around to changing the seal/fluid. After replacing the cover with the new seal/fluid, I noticed we've still got a leak. Where the bottom of the cover meets the actual differential there is a hairline crack.

Have the new cover/seal package on order, going to replace it this weekend. One question though, what fluid is recommended for this truck? It's a 2001 Silverado 1500, Ext. Cab, 5.3L Vortec, 4x4, 10-bolt rear end.

Thanks,

-Dane

 

I used 75w-90 synthetic I do believe...which I'm pretty sure I read is what came out of it

 

Okay, that's also what I was told, but when we changed the seal/fluid last week my buddy said 90W-140 (or is it 140W-90?), so that's we used. He said the locker in the rear end needs this (although he has a 2500 HD). The truck is still sitting and hasn't been driven since the change, so if that's not the correct fluid I still should be okay until this weekend when I change the cover/seal/fluid again.

Thanks again,

-Dane

 

It's 90-140, Unless your pulling alot, and in hot weather, I'd go also with 75-90W

 

Noted.

Thanks boys,

-Dane

 

Specs say SAE 80W-90 GL5 (P/N 10950849).