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1958 Plymouth 120mph to 150mph speedometer question

From: Mike "Pony" Poniatowski
Date: July 19, 2001


I have recently installed a factory 150 mph speedometer in my 1958 belvedere that had a 120 mph unit in it. The 150 works fine, but it is not calibrated correctly. I am running a 318 with 3 speed automatic. Can anyone suggest a way to solve this? Do I need to change the small gear inside the trans or something? Any suggestions would be greatly appreciated. Thanks all.......Pony


Last changed: July 19, 2018