Axle Fluid Changes

[AH64ID]

Your call but no reason to use anything other than 75-90
Unless you are towing heavy.

Even then my conversations with AAM indicate that nothing other than 75w-90 is needed unless one tows at/above GCWR thru Death Valley all the time. The engineer I spoke to was very confident in their axle and 75w-90.

75w-110 is a nice tweener for folks wanting a little more, but for 99% of people I don't think it's warranted in this axle.

I've never seen anything in writing from AAM or Dodge/Ram indicating anything but 75w-90 for the 3rd and 4th gen axles. Dana had a different opinion, then again it's been a lot of years since Dana was used and there have been fluid and machining improvements since then. Heck the '19+ cummins calls for a 10w-30. Times are changing.

 

[OLEJOE]

Thanks for the info.

 

[Cummins12V98]

Only negative with 75-110 is less mpg but that is minimal. But it will give better protection for my load IMHO.