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1989 tmc needs to faster shoan 5-9-05  
1989 tmc 40ft 3 speed auto 6-92 go's 60 now want to at least 75mph
Re: 1989 tmc needs to faster TomC 5-22-05  
You probably have 5.56 to one rear end ratio that gives you 60mph at 2350rpm based on 480 rpm tires (12R-22.5). You can go to 4.11 to one that will give you a top speed of 81mph at the same 2350 rpm. With the 6V-92TA, have it bumped up to 350hp from the 277hp, and you'll have a nice performer. Good Luck, TomC
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