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Click on image for the lowdown. 
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Global Mod,
Mod | | | Forums66 Topics128,030 Posts1,055,419 Members48,422 | | 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: Mar 2001 Posts: 316 Member | | Member Joined: Mar 2001 Posts: 316 | Why get your hands greasy?
Try this:
"Jack up one tire if you have an open diff, or both tires if you have a working posi or locking differential. Rotate the tire one full revolution for posis and lockers and 2 full revolutions for open diffs. Carefully count the number of full
revolutions the driveshaft makes. This is your gear ratio. In other words, if the drive shaft turns 3 & 3/4 turns, you probably have a 3.73 gear ratio. Turning the tire for twice the
number of full revolutions and dividing the drive shaft revolutions by two will give you a more accurate reading." (quoted from West Coast Differentials)
*** GMC ***
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