Gear Oil

[68PowerWagon]

Once my truck is broken in I would like to change the diff oil. Looks like Amsoil is currently out of 75W-90. Wouldn't I be ok to put 75W-110 in my rear diff on my 2022 3500srw? I will be towing all summer long so I think a little bit heavier weight would be better anyway. I have a few quarts left over from a previous order that I will use for the front diff so this would only be for the rear.

 

[tjfdesmo]

The 12" AAM rear diff calls for 140 weight.

 

[68PowerWagon]

I wanna say that is what they put in the dually's but not the srw. I don't have the truck yet so I can't just look it up in the manual.

 

[tjfdesmo]

I think if it's and HO/Aisin it gets the 12", even on a SRW.