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Need to know a 383 w/TH350 in a 1964 GMC truck longbed?
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05-05-2016, 11:50 PM
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Captainfab
60-66 Nut
Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,254
Re: Need to know a 383 w/TH350 in a 1964 GMC truck longbed?
Installing an OD trans behind the I6 or changing the differential gears as well as taller rear tires will help reduce your highway rpm's. What rpm's is your engine turning at 50mph?
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