Rear Differential Capacity 2500HD

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Jonathan Race - 30 Apr 2005 02:49 GMT

Can anyone tell me the capacity of the rear diffenential on a 2004 Chevy
2500HD 2wd (Duramax, Allison, 3.73 gears)? Also, what type/weight of lube
to use - I presume it's 75w-90 but the owner's manual doesn't list anything
for the differential. The housing looks pretty big, like it might take a
gallon or so (plus additive because it's a locking rear end), but I'd like
to know before I get into it.

Thanks in advance - Jonathan

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shiden_kai - 30 Apr 2005 06:43 GMT

> Can anyone tell me the capacity of the rear differential on a 2004
> Chevy 2500HD 2wd (Duramax, Allison, 3.73 gears)? Also, what
> type/weight of lube to use - I presume it's 75w-90 but the owner's
> manual doesn't list anything for the differential. The housing looks
> pretty big, like it might take a gallon or so (plus additive because
> it's a locking rear end), but I'd like to know before I get into it.

It depend on what particular rear end you have. But the largest
one takes around 3 liters....so you'd be safe if you got 3 liters.
Synthetic 75W/90 is the recommended lube for all of them.
The locking rear ends do not require any friction modifier.
In fact, the manual specifically mentions "not" to use it.

Ian

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