Corrections:
5th gear is exactly a 1:1 ratio on the manual transmission.
5th gear with stock tires and 4.88 gears (the way Jessee put his jeep on the dyno) would max out at 122 mph at 6500 rpm.
5th gear with his 37 inch tires and 4.88 gears would max out at 141 mph.
For comparison:
4th gear with stock tires and 3.73 gears would max out at 128 mph.
4th gear with stock tires and 3.21 gears would max out at 148 mph.
Therefore:
Jessee's jeep with stock tires in 5th gear is similar to a stock jeep with 3.73 gears in 4th gear.
Jessee's jeep with his 37" tires in 5th gear is similar to a stock jeep with 3.21 gears in 4th gear.
Information calculated using: http://www.grimmjeeper.com/gears.html
Using 30.75" as the actual mounted diameter of stock tires and 35.5" as the actual mounted diameter of the 37" tires.
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