SS #670 Gear Ratio calculator

Here is a cgi I wrote to do gear ratio calculations. You can use it to try out different rear end gears and tire sizes. Note that there are two ways of entering the tire size. Be sure to check the radio box next to the method you want to use.

This table shows the specs for SS #670 which has the Borg Warner T56 six speed manual transmission (RPO MM6) and 3.73 gears:


SS #670 with MM6 manual and 3.73 gears

Gear Ratio Final MPH @
RPM
RPM @
MPH
1 9.92 44.9 7356
2 6.64 67.0 4923
3 4.85 91.8 3595
4 3.73 119.3 2765
5 2.80 159.1 2074
6 1.86 238.7 1383
R 10.82 41.1 8020
Axle ratio
Wheel diameter inches
Wheel circumference inches
Revolutions per mile
Tire size /- (mm/%-inch)

Here are tables for some other configurations:


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Craig Leres