Moparmadness408
Well-Known Member
So I have a 1967 Plymouth valiant that I just did an engine swap in, and when my speedo says I’m doing 80 I’m actually doing 60 mph. It has the 727 torqueflite with 27 inch diameter rear tires and a 3.55 gear set in the rear end. What amount of teeth of speedometer pinion do I need?