Dodge Cummins Diesel Forum banner
  • Hey everyone! Enter your ride HERE to be a part of this month's Ride of the Month Challenge!

1 - 3 of 3 Posts

·
Registered
Joined
·
214 Posts
Discussion Starter #1 (Edited)
Probably a simple question, but I'm for some reason having trouble finding the answer... keep getting different answers from guys I thought would know.. so figured someone here would know or at least be able to come to an agreement on lol

Anyway, I am putting on a carli diff cover on the front and figured I would change the rear fluid as well. I looked in the manual and it says us 75w90, but I cant find the capacity. Also, is mobile 1 syth. ok? I would go amsoil, but can't afford it this time around... gotta go cheaper. Open to other suggestions as long as I don't have to order online (I need it by this weekend since I'm going wheeling).

Thanks

sam

BTW the truck is a 07 Ram 3500 4wd.. don't know which rear axle (there was more than one option if I remember right? There should be a tag on the diff correct?)
 

·
TECH SPECIALIST
Joined
·
5,878 Posts
2L front
4L rear
so plan on 7 qts.
Dodge/AAM spec full synthetic 75w90 so Mobil 1 would be great. Valvoline also makes a quality synthetic 75w90 for less money. I would avoid the off brands such as Coastal and Wolf.

wipe the bottom of the diff. case with an old T shirt, absorbent but doesn't leave lint to kill bearings.
cleans up any water and moisture that may condense. good time to check the breather tube that it's still there and not plugged, brush rips them out.

fill to it hits index finger tip bent into hole at first joint or just fill to bottom of fill hole and slight drip out.

the diff. cover seals are designed to be reused so you'll save some money there. no need but some use a very light coat of Permatex sealer on the gasket surface. very light, too much and it beads up, rolls over and comes off into the lube causing all sorts of problems. torque the cover bolts, don't guess and end up with a broken off bolt or a leak and dry diff.
fill plug only snug otherwise they seize.
 

·
Registered
Joined
·
214 Posts
Discussion Starter #3
Thanks for the detailed reply. I went with mobile 1... any idea what the torque specs are for the cover? Dont know why this isn't in any of my manuels...
 
1 - 3 of 3 Posts
Top