Re: rear end ratio?
Quote:
Originally Posted by 71enthusiast
Alright heres my math-
20168/27 inch tires=746.96 tire revs/mi
746.96x4.10 gears=3062.54 engine revs/mi at 60
3062.54x1.17(70/60 rounded)=3,572.96 engine revs at 70
however my truck does 3700 rpms at 70 granted that it is right..so lets work backwards-
3700rpms@70 /1.17(70/60 rounded)=3162.39 rpms @ 60
3162.39/746.96 tire revs/mi = 4.23 gears
4.23 gears does that sound right? ![dumm](http://67-72chevytrucks.com/vboard/images/smilies/dumm.gif)
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That's the same answer I got when I figured it my own way, I figured 4.11 was closest and not too far off considering margin of error of tach and speedo. I say if you have never cracked the case on the rear, you might as well because its not that hard and it's good to change out the fluid and it takes out all the guessing of what ratio is in there.
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68 3/4 ton ![Gmc2](http://67-72chevytrucks.com/vboard/images/smilies/gmc2.gif) (Project)-350 Small Block, .030 over, 10:1 comp, 3998993 heads, C3BX edelbrock intake, comp cams XE268, Holley 670 SA, long tube headers, dual flow 40's, E-fan, Alum rad, currently under the knife getting shortened and bagged build thread
41 3/4 ton ![Gmc2](http://67-72chevytrucks.com/vboard/images/smilies/gmc2.gif) (wife's)-flatbed, fully restored to original
01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's
02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's
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