Pirate 4x4 banner
1 - 8 of 8 Posts

·
Registered
Joined
·
51,897 Posts
Discussion Starter · #1 ·
i have a rear end out of my 70 fj40 how do i find the gear ratio? i made a mark on the drum and another where the drive shaft hooks up but when i do 1 complete turn on one i also get 1 complete turn on the other one. what am i doing wrong? whats the correct procedure?
 

·
Registered
Joined
·
2,298 Posts
if both wheels (drums in this case) are turning at the same speed, then count the # of pinion rotations that makes BOTH the tires rotate once.. if it's an open diff you can hold one tire still, then turn the pinion and count revs to rotate the one free drum TWICE.. both of those counts at the pinion will give u your gear ratio..
 

·
Discount!
Joined
·
4,439 Posts
First off, the gear ratio is 4.11, however if you really wanna double check, pull the diff cover off and count the ring & pinion teeth. Then divide the # of ring gear teeth by the # of pinion teeth.

Example: 37 ring teeth divided by 9 pinion teeth=4.11
 
1 - 8 of 8 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top