M-F 8-6pm
Sat 10-2pm
1-866-441-8699
1-812-379-1134

Contact us!

Search this site

Cool Pages:
Gear Calculator
Build Quote
Tech Tips
 

Great for:
  Pro-Touring
  Hot Rods
  Street Rods
  Musclecars
  Pro-Street
  Drag Race
  Road Race
  Trucks
  and more!

Owned & Operated by

Columbus, IN

Ph: 1-866-441-8699

Determining your rear-end gear ratio.

The only 100% accurate technique is to count the # of teeth on the ring and pinion gears, and divide them.

Need to figure out your rear end gear ratio without actually counter the teeth on the gears? Here's a reasonable technique:

1. Put rear on jack stands (safety first!)
2. Wrap a long cable tie around the driveshaft, but don't cut the 'tail'. Point it straight up at the 12:00 position.
3. Put a mark on a tire, like at 6:00 position.
4. Put the trans in Neutral.
5. Turn the wheel exactly 1 revolution, noting how many times the driveshaft turns by watching the cable tie.  The key is to be as exact as possible.
6. Note the position of the cable tie tail.

Now, if the cable tie made 3 revolutions, and is at about the 1:00 position, then it's likely a 3.08 gear.   3.5 revolutions, then a 3.55.  4 revolutions, 4.10, etc.

Not 100%, but should get you close.  The bummer is that it'll be difficult to tell a 3.23 from a 3.31, etc.

©  2008 Wedan Street & Performance All rights reserved

This website is a comprehensive collection of information regarding the installation of TREMEC transmissions into various vehicles. Material contained in here may be reproduced for PERSONAL USE ONLY. No material may be redistributed in electronic or printed form without the written permission of Brad Wedan (owner). Owner believes to the best of his knowledge this information to be correct, however no warranty is made as to its accuracy. Owner also disclaims any liability for financial loss, property damage or injury in connection with use of this information. Not affiliated with, endorsed or compensated by TTC, or any sanctioning body mentioned within. Any trademarked names are property of their respective trademark holder and are used for identification purposes only. Portions of this website may be copyrighted by other individuals or organizations.