shortstack Posted December 16, 2011 Share Posted December 16, 2011 Yeah from what I've heard it's about a given they will need it sometime but once they are changed over they don't seem to give anymore trouble. Just some of the "bugs" that had to be worked out of the first ones. If it's had that done already it should be good to go. Trey Quote Link to comment Share on other sites More sharing options...
joes mack Posted December 17, 2011 Share Posted December 17, 2011 the company i used to work for had 10 GU,s with the 390 mack 10 speed set up. with 8.26 rear gear ratio they were coal trucks and pulled 35 to 45 tons every load but they also had 65,000 lb rears under them. the trans were very good the only problem we had out of them was the p.t.o. /pump they were so heavy it would strip the 3 5/16 bolts from the spacer between the p.t.o./pump until we made rear mounting brace out of 1/8 inch angle iron and that solved that problem. Quote Link to comment Share on other sites More sharing options...
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