Thread: RPMs?
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Old 12-30-2018, 10:41 AM   #6
1929
Senior Member
 
Join Date: Jan 2015
Location: New York
Posts: 943
Default Re: RPMs?

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Quote:
Originally Posted by GRutter View Post
It depends on wheel diameter. Assuming from your user name that it is a 1929 model.
If you have 21" wheels with a dia of approx 30" your speedometer should show close to 62 mph for a 3.54 rear.
If a 30-31 with 19" wheels, your speedometer would be closer to 60 mph with a 3.54 rear.

If you are reading 58 mph I would believe you have a standard 3.78 rear and not a 3.54. Why do you think you have a 3.54 rear? Did you rebuild and change ring & pinion?
I installed the 3:54, but, I have 16 inch wheels.
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