Originally Posted by Sahara97
I have a dana 44 in the rear and the 30 on the front. I have seen and been told different things about what to change the fluids out with. I was told that I needed to use 80w-90, and if you had a trailer towing package use 75w-140 syntheticis this correct? I have a limited slip rear end in it. So obviously I need to add an additive to it. Is the difference in lube just for heavy duty applications then? Is going to matter which viscosity I use? Also the front uses the same minus the additive correct?
Use whatever weight you want, if you tow use the heavier. If you have a LIMITED SLIP you need the additive, if you have a mechanical locker you do not need the additive.
One fact: Leave ONE BOLT in at the top of the cover, loose, when you pry the cover off unless you want a face full of lube when it falls off into the drain pan...