75w - 90 is what you use right? and does it matter what kinda locker and axle you have? or is it just 75w-90 across the board for us? sorry if this is a dumb question

 

I have only used 75w-90 Royal Purple gear oil in my axles...don't need any LSD additive with Royal Purple.

 

I use 75W-90, but the manual calls for 80W-90. It is worth noting that the manual also calls for 75W-140 if you are towing.

I use Mobil-1, and as far as I have found that only comes in 75W-90.

 

just for future reference, ARB told me not to use 75 140 if you have an ARB locker. They feel one contributing reason why my o-rings blew was because I was running 75 140. Now they did not say it was THE cause but they feel it contributed to the failure.

edit: I was running 85 140 when the o-rings blew front and rear.

 

and I'm sure this will cause some conflict since this or the 85 140 was what ARB said a while back to use. But maybe in my case of the blown o-rings, they want me to run another oil weight.

I have also seen on other forums that people who used the higher oil had blown o-rings too, but once switched to lower, everything was fine.

 

Same here, its the best!

 

Amsoil 75w90 in the front and Amsoil 75w140 in the rear for trailer towing. No additive required with Amsoil.

 

Personally, I stick with what the manual states which is the 80W-90. My local auto stores carry it in valvoline brand with limited slip additive already in it.