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Tru2Chevy · 04-03-2006, 10:57 AM

That's a 27" tall tire, as compared to a 25.6" tall tire.

In overdrive, with that gear and tire @ 90 mph you should have been turning approx. 3,575 RPM. Do you have the correct speedo gears in your car for the gears and tire size that you are running? 3100 RPM works out to about 78 mph.

- Justin

04-03-2006, 10:57 AM	#16
Tru2Chevy Co-Founder / Site Admin Join Date: Jul 2004 Location: Ewing, NJ Posts: 22,476 iTrader: (8) Social Networks:	That's a 27" tall tire, as compared to a 25.6" tall tire. In overdrive, with that gear and tire @ 90 mph you should have been turning approx. 3,575 RPM. Do you have the correct speedo gears in your car for the gears and tire size that you are running? 3100 RPM works out to about 78 mph. - Justin __________________ 1999 Camry - Beigemobile DD 2002 Suburban - Wife's DD 2004 Grand Cherokee - Not running / Project / Selling?