What weight oils should i run in tcase and front and rear ends in my 92 w250. what is the quanity also

 

do you haul with it often?

 

Capacities are in the sticky. I'd do 80W-90 in the front and xfer case. For the rear diff it depends on what the truck is used for. If you just putter around like me, then run 80W-90. If it's a tow rig use 85W-140 synthetic.

 

I used Amsoil in mine (rear) and dropped about 10 degrees, according to the magic Infrared temp gun. Gee I have a spare electric Trans temp guage, should I?

 

The only down side I've seen with the 75/140 is that it retains too much water - as per an oil analysis. The 75/140 simply does not get hot enough - in normal driving to boil off water. I would suspect that if you tow a lot this would not be an issue.

Bob