I didnt want to go throught the hassel of pulling the diff cover and counting the teeth...so i was wandering if anyone knows what gear ratio came in a 1964 Buick Special 2-dr coupe with the 300 an power glide setup....i was guessing around 275s....i put the 455\Th400 conversion in it and it feels really doggy through gears if anyone can tell me id be really helpfull..
They could be 2.56 gears. You can jack the rear end up spin the tire 1 complete rotation and count the number of time the drive shaft spins. 2 1/2 is 2.56, 2 3/4 is 2.78, just under 3 is 2.93 and a little more than 3 times is a 3.08.
