| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,208 Posts1,057,446 Members48,471 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jul 2008 Posts: 1,262 Shop Shark | | Shop Shark Joined: Jul 2008 Posts: 1,262 | If you have a non-posi differential, the spider gears double the rear wheel speed when only one wheel is off the ground. To get an accurate ratio estimate with only one wheel jacked up, it's necessary to turn the rear wheel twice and count the driveshaft turns. Another, possibly more accurate method is to make a mark on the tire sidewall, roll the vehicle straight forward one turn of the tire, and count driveshaft revolutions. I prefer to pull the cover plate, count teeth, and get out the calculator!
Jerry Rotate the tire one full revolution for posis and lockers -or- 2 full revolutions for open diffs.  | | |
|
|
| |
