My 2002 service manual states the rear diff with limited slip 2wd Dana 80 requires 6.3 pts (3.0 L) gear oil and the 4wd requires 9.5 pts (4.5 L). Is there a difference between 2wd and 4wd rear diffs? I had mine parked beside a friends 4wd, almost the same truck as mine except a 4wd. Anybody know why, or is this a misprint in the service manual? Just trying to find how much of the expensive synthetic gear oil I need to get, I’ve done a search and noticed a few different recommended quantities. I'll probably go ahead and get 6 qts anyways. ;D

 

I looked it up on dodgeram.org, and it says:<br><br>4x2 6.8 pints<br>4x4 10.1 pints<br><br>Which is interesting. Makes me wonder what the difference actually is. Bigger cover? Bigger axle tubes?

 

Didn’t measure, but by a quick visual inspection the 2wd and 4wd rear diffs appear to be same size, diff cover axle tubes every thing. I could not notice any difference.

 

I could almost get 4 quarts in my dana 80 2wd.<br>hth