OneTon:
Asked this same question a while back for my '49 1/2 ton. I used 90-120 wt hypoid Valvoline oil in the rear end and used 50 wt HD motor oil in the tranny. Don't know if it's the same for a 1 ton or not.


Country Roads, West (By God) Virginia
http://community.webshots.com/user/geezer