Thread: Is there an overdrive for 4 speed trans?
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Old 06-22-2016, 08:16 PM
Bill Hanlon's Avatar
Bill Hanlon Bill Hanlon is offline
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Join Date: Feb 2005
Location: Fredericksburg, TX
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Originally Posted by Faustmill View Post
67 GTO with Muncie 4 speed and 3:55 rear.
I am turning 4000 rpm at 70 mph and 3500 rpm at 65 mph.
If you are turning 3500 rpm at 65 mph you should be running 74 mph at 4000 unless you have a bunch of clutch slip. Just curious, what is the diameter of your rear tires?

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