Ken, this may or may not help you, but there is a nifty
link on the DML homepage that deals with this.
http://www.dakota-truck.net/TIRECALC/tirecalc.html
-Kevin D.
>
> Date: Wed, 25 Oct 2000 15:09:33 -0800
> From: kenh@photocenterimaging.com (Ken Hoffman)
> Subject: DML: Gearing VS Tire Dia
>
> hey kids,
> Have any of you changed your rear end ratio to compensate for larger
> diameter tires? My Dak is a 99 4x2 v8, now w/ a fabtech kit, and I'm
> changing from 235/75/15 up to 10.5x31s. I'm currently
> running a 3.55sg
> and am considering 3.92 (or is it 3.90) to compensate for the larger
> tires. I would rather spend the money to do it that way
> than HOPE that
> the dealer reflashes to computer PROPERLY to ensure accurate
> speedo and
> computer signals. I'm ignorant as to the proper mathematical
> equation to
> calculate the rpm difference to see wether that ratio change
> would even be
> appropriate. (runon sentence:0) -----Sooooooooo, if any of
> you have done
> this or could help me out on the calculation, it I would sure
> appreciate
> it!
>
> thanks,
> ken H
> Simi Valley, CA
>
> "The shortest distance between two points is a straight line"
>
>
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