ben384608 Posted December 13, 2010 Share Posted December 13, 2010 I have an 88 suplerliner with a 350 mack and 9 speed trans. I had the fuel turned up and the truck runs much better. My biggest gripe is that whenever I have to climb a hill (not just big ones) the truck dies off. If I changed my trans from a 9 to a 12 or 13 would it make much of a difference? I know I won't have more power but it just seems like a few more gears would be nice. Just a rookie and any help greatly appreciated. Quote Link to comment Share on other sites More sharing options...
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