Matt - you're joking, right? Tell me you're joking dude.
Tires have nothing to do with the relationship between drive shaft
and axle speeds.
Cale Bargen
Barret, Matt wrote:
>
> HEY BOB, WHAT ARE YOU THINK'N, IT A NO BRAINER?? THE BIGGER THE TIRE THE
> BIGGER THE DIAMETER, THUS THE MORE TIMES THE DRIVE SHAFT WILL TURN FOR EVERY
> REVOLUTION OF THE TIRE.
>
> -----Original Message-----
> From: Bob Tom [mailto:tigers@bserv.com]
> Sent: Thursday, August 12, 1999 7:29 AM
> To: dakota-truck@buffnet.net
> Subject: Re: DML: RE: Ring Gear changes: 3.55 vs. 3.90
>
> At 09:38 AM 8/12/99 -0500, you wrote:
> > [snip]
> >I've done the tire/rotation check more times than I care to count (from
> >past shops and over the years) so I know what i'm doing. You don't have to
>
> >turn it 10 times...three or four is more than sufficient. But what the
> >heck, it all averages out the same.
> > [snip]
>
> Unless I am missing something in the interpretation, I will have to
> respectfully disagree that jacking up the rear end, rotating the tire
> (one which is a different diameter than stock) one complete revolution will
> result in a change in the no. of revolutions of the driveshaft.
>
> Visualize, if you will, for a minute. Gear ratio is 4.10:1 (for example
> only).
> Put a straight line mark on outer edge of the stock tires sidewall. Place
> a straight
> ruler (whatever) on the marker and through the center of the axle shaft,
> extend this marker
> to the outer edge of the rim and draw another marker.
>
> Rotate the tire one complete revolution. The driveshaft will have turned
> the 4.10 revolutions. Note also that marker on the rim will have also have
> made
> one complete revolution, no more and no less. Therefore, a bare rim (i.e.
> tire diameter of zero) with one complete turn will also give the same 4.10
> revolutions of the driveshaft.
>
> Now, imagine a larger (or smaller) diameter tire and put a marker on its
> sidewall
> in the same way as above. How many times will the driveshaft rotate? 4.10
> rotations.
>
> The only way to see a difference is to have the truck on the ground, put a
> marker
> on the ground where the marker on the stock tire is, push the truck so that
> the tire
> rotates one complete rotation, put another marker on the ground where the
> tire's
> marker now is and measure. Now, repeat but with the tire swap and count
> the number
> of driveshaft rotations. This is the 'effective gear ratio'.
>
> Apologies to all concerned if this can be proven incorrect. Again, sorry
> for the
> length, but when the industry refers to higher gears and, yet numberically,
> the number
> is lower, it is against normal comprehension and is complex.
>
> Bob
> Burlington, Ontario
>
> '97 CC Sport, 5.2L, 3.55, auto., 4x2, flame red
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