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cowboy1948 · 07-15-2010, 06:44 PM

here is another good formula. tire diameter to calculate new gear ratio.

new tire dia divide by old tire dia times your current gear ratio equals your new gear ratio.

29.7 divide 28.7 times 3.27 equals new gear ratio of 3.38

07-15-2010, 06:44 PM	#4
cowboy1948 Drives: 10 LT2/RS-08 SILVERADO-05 COBALT Join Date: Jun 2009 Location: OHIO Posts: 929	here is another good formula. tire diameter to calculate new gear ratio. new tire dia divide by old tire dia times your current gear ratio equals your new gear ratio. 29.7 divide 28.7 times 3.27 equals new gear ratio of 3.38 __________________ Retired