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Click on image for the lowdown. 
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| | | Forums66 Topics128,137 Posts1,056,471 Members48,441 | | 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: Dec 2008 Posts: 319 Shop Shark | | Shop Shark Joined: Dec 2008 Posts: 319 | Couldn't find anything in my search here. I've been catalog shopping for rear end gears (Jegs, Summit) and now have questions about the venerable 12-bolt truck rear. Seems there are "3-series" and "4-series" carriers, each with a different range of gear ratios available. The overlap appears to be 3.73:1, with lower ratios for the 3-series and higher for the 4-series.
Questions: How do you tell the difference, if you've got 3.73? Are they interchangeable in the same housing?
It's a '65 C10, and it seems easier to swap the carrier than the whole assembly.
cm If you can't fix it with a hammer and screwdriver, you need a bigger hammer.1965 Chevy C10 | | |
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