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Was wondering, since the rear end in my car is original, any idea what the rear end gear ratio would be? 3.70? I a 9 inch I know for sure
Performance? Yes. Street? Not so much unless you have overdrive or don't care that your engine RPM's will be about 3800 at 80 mph with 26" tires. Not fun if you cruise much. I don't even enjoy my 3.25's much on the highway as I turn around 3400 at 80. Gets old fast. Need OD....3.70 was never a factory Cougar option, to the best of my knowledge, but its a good street performance ratio...
Sure. Cost....Can anyone give me a valid reason not to upgrade to the modern era with an overdrive trans????
You've got it backwards -- the driveshaft will turn more than the tire. So if one revolution of the tire makes the driveshaft turn 3-1/2 times, that's a 3.50.Easy way to do this...raise the rearend, place on stands, place in neutral, rotate the drive shaft to any starting point, like using one of the u-joint cups and mark it with soapstone (just one mark) and then rotate the tire one complete revolution, count how many times the drive shaft rotated... so if the tire rotates ...say 3 times and the drive shaft makes it about 3/4 revolution...then you'd have 3:70..know what I mean Vern?
Yep you got me on that...it's been a long day. Mea Culpa.You've got it backwards -- the driveshaft will turn more than the tire. So if one revolution of the tire makes the driveshaft turn 3-1/2 times, that's a 3.50.
Still a 9"So does this mean its a 8" instead of 9"? Or could it still be a 9?