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Old 04-10-2019, 11:49 AM   #20 (permalink)
Ecky
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Quote:
Originally Posted by racprops View Post
I am thinking that a second overdrive added to a stock 4 speed auto with a OD gear can work and in fact greatly increase a stock car/vanís MPG, just by lowing the cruse RPMS from around 2400 RPMs to 1700 RPMs.

This seems to be the best of all worlds, stock gearing until the added Over Drive is engaged then the advantage of super highway gearing.

Your thoughts and knowledge is invited.

Rich
The devil is in the details. Do you mean turning a 4 speed into a 5 speed, or just swapping the 4th gear for a taller one?
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