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Posted by Doug Cartwright [50.37.87.222] on Monday, October 17, 2011 at 22:42:13 :
In Reply to: Gear oil GL-1 vs GL-5 posted by D Sherman [72.47.9.228] on Monday, October 17, 2011 at 22:18:59 :
GL l is too thick when it is cold (or cool)too.
The gl 5 is a pretty good all temp oil.
My 91 dodge FSM calls out GL 5 for the np 435
I don't have any pre 60's trucks,so I can't help you there...