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Can anyone tell how many revolutions per mile the speedometer cable turns? 120-130

posted by  malloy1 on  Wed Apr 16 15:57 CST 2008
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last visit: Sun Oct 12 17:44 CST 2014
[RELATED]

Thanks!

I did find something that stated that all speedometer drive gears are standardized to rotate at 1000 revs per mile.

I also I found how to figure out the revs per mile of the output shaft of the transmission. Basically, the number of rotations of wheel size per mile (->number of inches in a mile/circumference of the wheel size) * rear gear ratio = drive shaft revs per mile. For a 122 with a 4.1 rearend, and 165R15 tires:

800 * 4.1 = 3,300 revs per mile

The 800 was 63,400 inches per mile divide by 79.2 inches of the circumference of the 165R15 tires.

Paul






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