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#1
03-07-2007, 07:36 PM
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Calculations don't match gear ratio, help?
I have 3.07 stamped in my housing. It has been open at least once judging by the silicone sealant used. My calculations say 3.40. Ok, see if I missed something.
engine rpm 3500, actual speed 75, tire diameter 24.5"(estimate, same size as new tires minus tread) 3500 engine rpm x 1:1 trans ration = 3500 driveshaft rpm. 3500 / 3.07 rear end ratio = 1140.07 tire rpm 1140.07 x 60 = 68404.2 tire rph 68404.2 x (3.14 x 24.5) = 5262335.1 tire inches per hour 5262335.1 / 12 / 5280 = 83.05 miles per hour Why is my number different by 8mph? Is my torque converter slipping that much? Is my tach off by 340 rpm? Is my gear ratio really 3.4?
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I suggest we solve high gas prices with environmentalists... unfortunately they don't burn well. 1982 300CD, 220K miles: This vacuum system will be the death of me yet! (OBK #26) 1977 F150 400 C6 2wd, 10.2 sec 1/8 mile with 2.75 gears. 1965 Mustang. Mostly stock... LOL! 2001 Ram 2500, cummins, 5spd, 202k miles.(girlfriends) 
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