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I am not really wanting to have to alter the cab if I can get away with it. I am only considering the 4BT engine since it is relatively ease to increase the horse power on these engines, just the same as a 6BT, it is the short version. I do have an old GMC duallly 4x4 with a manual tranny in it...

Mpg Just a quick thought here. I own a 1955 M135 and am also pondering a repower since my old 302 is missing lots of parts and is seized. I am currently looking to swap the ring and pinion to a numerically smaller ratio. The part numbers for the sets are H110. Think they were made by EATON. At...