i have a 1995 cummins and i am trying to find out what weight to use in my fron and rear axels i pull i daily drive it and pull horses , trucks and sometimes farm tractors in the summer it get up to high 90's and in the winter is get down to -5 at times whats the best weight oil i should run

 

I'm pretty sure you can put 75-145w in both axles. You especially what that if you do some towing.

 

https://dodgeforum.com/forum/2nd-gen...uid-types.html

 

Yep, 75W-140 for heavy use.