I know this has been asked a thousand times so lets make it 1001 for this newbe. When I change my differentials after 500 or so miles I'm considering amsoil or grape juice. What do most of you knowledgable diesel heads think?


Scott

Go Grape and don't look back.http://dieselplace.com/forum/smileys/Wink.gif http://dieselplace.com/forum/smileys/Thumbs%20Up.gif Anything that is C-5 will work. However, ya got at least 35k worth of warrenty to go....don't chance it.


Burner---------> http://www.dieselplace.com/forum/smileys/Big Smile.gif

I just did mine yesterday with dealer supplied ACDelco synthetic 75W90,


Apparently it is the same stuff, smells the same, but is cheaper than the GM part # listed in the book. I called GM about it and they tell me that they now supply the ACDelco stuff part #89021678.


The best part about it was that it was only $16.95 per quart Canadian $'s.


Interesting note for the record, factory fill was just a bit over 2 quarts when I dumped it, and the refill took almost 4. There were a few chips when I screened the oil and about 1/2 a thimble of sludge





Rob

Did you guys fill until it came out of the fill hole, or the 1/4" down from the hole,like they claim. Also on these did you put the limmited slip additive in?


Edited by: JUSTIFIED HD

Justified HD.....man, you better check out American Axel's website or somethin'. http://www.dieselplace.com/forum/smileys/Disapprove.gif

Did you guys fill until it came out of the fill hole, or the 1/4" down from the hole,like they claim. Also on these did you put the limmited slip additive in?








I filled it till it ran out a little........don't think 1/4" of fluid makes a difference.


Least I know it's full...........http://www.dieselplace.com/forum/smileys/Big Smile.gif





Thttp://www.dieselplace.com/forum/smileys/Clown.gifNY

Thanks guys, there has been so much talk about these rear diffs guys are making them out to be the space shuttles when I realize that it is just a standard ring and pinion. I'm a tech that has been in the industry for 7 years now. I was arguing with a buddy sittin here that you can just fill them all the way up and that they didn't need the additive, he says that GM says to measure down 1/4" from fill hole to have correct level. I too say bull $hit. So i said we'll post and see what comes up. Anyways thanks guys for your .02


Ryan

So, when did Chevy/GM go from the 10.5" corp diff to a 11" . My new LLY has the NEW? 11" rear diff in it? (2500HD ext cab)


JJ

Justified I think the GM by the book way is to leave it a 1/4" down but I'm not postive. Maybe a on-site tech can look it up.


But like has been said, most just fill it up till it spills out the hole. A little extra wont hurt.http://www.dieselplace.com/forum/smileys/Approve.gif


O2B12S I think they switched when they came out with the Duramax