Forum Discussion
Griff_in_Fairba
Jun 04, 2018Explorer III
StingrayL82 wrote:
I use this site and plug in the numbers
(1:1 on the transfer case, since it's a 4WD site): Final Drive RPM Calculator
2587 RPM @ 55MPH
2822 RPM @ 60MPH
Something's wrong 'cause I'm getting slightly different figures ... working them out myself.
Maybe you used LT235/75R16 instead of LT235/85R16. (Larger tire diameter and circumference means lower RPMs.)
Will post my figures in a few minutes ...
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