Rear End Question.......
Thread Starter
Melting Slicks
Joined: Feb 1999
Posts: 2,473
Likes: 10
From: New Paltz, New York USA
Rear End Question.......
I marked my rear tire and also the drive shaft. I turned the tire one full turn and the driveshaft turned just over 3 turns, maybe 3 1/8 turns. Does this mean I have a 3.07 rear end? Also, what would happen if I replaced the rear end with a 3.27 or something else would I mess up anything? Thanks in advance. 
Race Director
Joined: Jan 2003
Posts: 15,177
Likes: 90
From: State of Confusion
Originally Posted by Richard Cooper
I marked my rear tire and also the drive shaft. I turned the tire one full turn and the driveshaft turned just over 3 turns, maybe 3 1/8 turns. Does this mean I have a 3.07 rear end? Also, what would happen if I replaced the rear end with a 3.27 or something else would I mess up anything? Thanks in advance.
An even more-accurate method is to count drive-shaft revolutions over 10 tire revolutions:
it becomes easier to rule-out slack and sloppiness.
Going to a deeper gear (higher-numerically/lower-machanically) will help off-the-line acceleration, but reduce top-speed, fuel-mileage, and increase highway cruise RPM at any given MPH.
