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WVZR-1 · 09-18-2011

If the gear change was done and the proper drive/driven used to correct the speedometer the tire diameter change would be constant regardless of ratio.

I believe I'd start with the stand alone GPS unit and attempt to confirm the speedometer error as it is now. I'd use a Tech 1 (or similar) to confirm RPM's at speed and use a speed/rpm comparator for an easy check. The Tech 1 would also display speed.

Maybe the best and easiest is the tire/drive shaft revolution comparator done by "the eye" to determine axle ratio!

09-18-2011	#8
WVZR-1 Join Date: Oct 2004 Posts: 1,889	Re: Contemplating Rear Gear change If the gear change was done and the proper drive/driven used to correct the speedometer the tire diameter change would be constant regardless of ratio. I believe I'd start with the stand alone GPS unit and attempt to confirm the speedometer error as it is now. I'd use a Tech 1 (or similar) to confirm RPM's at speed and use a speed/rpm comparator for an easy check. The Tech 1 would also display speed. Maybe the best and easiest is the tire/drive shaft revolution comparator done by "the eye" to determine axle ratio!