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Click on image for the lowdown. 
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| | | Forums66 Topics128,014 Posts1,055,324 Members48,419 | | 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!
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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: Jan 2019 Posts: 2,242 Herder of Cats, Goats, and Sheep (moderator) | | Herder of Cats, Goats, and Sheep (moderator) Joined: Jan 2019 Posts: 2,242 | The ratio of the number of teeth between the drive gear and the driven gear is what matters. You see how it says the 20 tooth is for both the 3.38 and the 4.11? That is because the driven gear is different between them.
How sure are you that the 20 tooth gear you have is correct for the 3.9? It is possible that you need to replace both gears to have it be right. | | |
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