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Old 01-05-2023, 10:42 PM   #6
Accelo
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Join Date: Mar 2015
Location: washington
Posts: 2,358
Re: 72 Saginaw 3 speed Speedo Drive gear?

Your motor rpm will drop by 18% with the gear change.

For arguments sake lets say you installed a typical OD transmission.
You typically get a lower first gear that helps get you moving.
You get double the 18% percentage drop in overdrive. (35%)
If you add the cost of ring and pinion and possible a carrier change.
Then add the labor and compare it to the benefits of an OD.
Your budget and mechanical skills will give you an answer.
Cheers.
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