Hagen Brothers farms,Goodrich ND | When I bought an 80 model 35 GMC pickup in 85, the Trans was so stiff it took both hands to shift it in / out of gear during a starting attempt when the temp was -30F. I suspect that old 4 spd had mineral 90wt GL5 in it. I drained it and replaced the oil with Mobil 1 synthetic 75-90 GL5, Shifts easily at any temp now.
I use the Mobil synthetic 75-90 GL5 in my Crary air reel gear box. It runs much cooler than it did with mineral oil.
Edited by Jon Hagen 2/14/2012 23:28
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And I thought my Lucas oil was supposed to be good
