Sorry I do not have an owners manual.

Thanks
Chris

 

Rear Sterling 10.5 75w140, D50 front 75/80w90.

 

My truck say 75/90W for the front. Don't forget the rear is full synthetic and needs the limited slip additive.

 

I used lucas full synthetic 75w140 front and rear. didnt need the additive (think it already had a friction modifier in it). Whatever the case is the LSD is probably non functional after 100k miles or so, and the additive would only be needed to prevent annoying chatter (if that even occurs).

If your truck sees mud I would recommend convectional cheap gear oil and just changing it more often. I buy coastal in 5 gallon drums for around $55 for my jeep.