Guest bkc Posted July 13, 2012 Share Posted July 13, 2012 what is the gear ratio of the rear end in a 47-48 roadmaster?also how does it compare to the super of the same year?i want more top end from the super and i have the roadie rear end sitting around.can i gain enough advantage tobe worth the swap?would a later model year work better? Hard info to get hold of. thanks. Link to comment Share on other sites More sharing options...
Ben Bruce aka First Born Posted July 14, 2012 Share Posted July 14, 2012 bkc, do you have a shop manual? Your questions will almost all be answered in there. But for now, crawl underneath the car and clean off the bottom of the differential[rearend]. You will find a number stamped there. Probably a 4 with a - underneath it and a 1 or 4 beneath the line. Indicating a ratio of 4.1 or 4.4 to one. The entire "pumpkin" from 1940 through 1955 will interchange. A lot of work, but worth the time. I just did this with my '50 Special. By 1955, ratios of 3.36/1 , maybe faster, were available. I used a 3.36/1 from a '55 for mine. Dropped the crusing 3rd gear rpm about 650 rpm. Fantastic! Ben Link to comment Share on other sites More sharing options...
Guest bkc Posted July 15, 2012 Share Posted July 15, 2012 thanks. i think i will go for it. does your car still leave the stopp light with good power? Link to comment Share on other sites More sharing options...
Ben Bruce aka First Born Posted July 16, 2012 Share Posted July 16, 2012 Yes it does. I am very happy with it. I just drove from Missouri to Concord, NC and back. Ben Link to comment Share on other sites More sharing options...
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