Mechanics

WHY ARE RPM SO HIGH WHEN SPEED IS LOW?

1970 Pontiac GTO • 100,000 miles

I have a 1970 GTO which has a non original Pontiac 400 (1972), a non original M20 (1971) transmission and original 3.56 posi rear. The car drives and shifts fine. The car was originally a Auto and was converted years ago to a manual. I don't think the shaft was changed.

My problem is that the PRM get high very quickly in each gear. At 60 mph my RPM's are screaming at over 4000. Any idea where the problem could be?
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Thebestvman
February 13, 2012.



The only thing that can be done is gearing.