Quote:
Originally Posted by hat_man
I found this parts site and it showed a 3.27 in a 7.5" rear end.
Does anyone have any more information on these and can someone please help me with the math on rpm's with this ratio running in 5th gear (0.79 IIRC) at about 65 mph? Or if you can give me the math formula I can work it out.
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Start with the revolutions per mile of your tires. Then multiply by the rear end ratio, and multiply again by the 5th gear ratio. The result is RPM at 60 MPH.
Example: Assume your tires are 700 revolutions per mile (that's a random number I pulled out of a dark place). Then you would get 700 X 3.27 X 0.79 = 1808 RPM at 60 MPH.
To get RPM at 65 MPH, scale by ratio of speeds: 1808 X 65 / 60 = 1959 RPM.