Just a quick question, in 5th gear when I'm cruising at 2000 rpm can you give me a base at what my MPH would be, I'm assuming it has 2:73 gear ratio, thanks
My 3.08s with nearly stock tire height in 5th at 2k rpms give me 75 mph. I would guess you would be closer to 80 because of the lower gearing. You can figure out your gearing by jacking the rear of the tire off the ground and rotating your tires around one revolution and count the number of revolutions the drive shaft makes, this is your gear ratio.
Last edited by redwalsh87; 06-21-2009 at 05:28 PM.
Reason: Typo
You can figure out your gearing by jacking the rear of the tire off the ground and rotating your tires around one revolution and count the number of revolutions the drive shaft makes, this is your gear ratio.
Good idea but telling the difference between 2.73 and 3.08's like that would be real tricky, hey I'm in Middlebury work in watertown, where you at?
it shouldn't be to tricky, rotate the tire once and see how much the driveshaft rotates, its going to rotate just over 3 times or about 2 and 3/4 times, you should be able to tell the difference just fine, take some chalk and mark the bottom part of the drive shaft and lowest part of the tire
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1988 Mustang GT, TTops, 306, AOD with 4r70w gearset and shiftkit, E303 Cam, Ford Racing headers, BBK H-pipe, Flowmaster Cat Back, 3.73's, Traction lok with F150 spring, Eibach lowering kit, B&M Tork Master 2400 Converter, trans cooler, C&L 76mm Mass Air, Accufab 70mm throttle body, K&N filter, Mass Air conversion, Subframe connectors, Lots of Polyurethane, 210HP at 4500rpm, 272 Torque at 3600rpm at the wheels, best 1/4 mile: 14.12
1985 mustang GT 5th gear mph? 
