Revving 4000 rpms on the highway
Hey Guys, pickuped up a 70 Dart swinger 340. It's supposed to be 3.73 gears which feels about right ( I had a 3.91, 360, TF 727 Auto before). For some reason the tach is reading 4000 RPMs at 62MPH, I verified the speedometer is correct with a GPS app. Should I not be revving around 3200 rpms? Is it possible that the tach ratio is wrong? The tach seems to work ok at idle, it's right around 900 RPMS. I suppose I can check it with one of those cheap little digital things that you wrap around the spark plug wire?
