What gear oil for front and back diffs

[ROGELIO A GUZMAN]

Hey fellas what gear oil you guys using for the diffs. I'm kinda leaning towards aimsoil severe duty 75w90.

Any advice is really appreciated. And doing transfer case also. I think that is trans fluid. Correct me if I'm wrong. Thanks in advance.

 

[mpope2]

Front diff is 80w90. Rear diff with factory gov lock is 75w90. Some aftermarket carrier manufacturers suggest different weights for various limited slip units. Some also require a friction modifier additive, some do not. If yours is OE, just do 80 up front and 75 out back and call it good.

 

[Big Mama]

If you have the owners manual it’ll tell you if limited slip additive is needed out back.

 

[ROGELIO A GUZMAN]

If you have the owners manual it’ll tell you if limited slip additive is needed out back.

Thank you