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Click on image for the lowdown. 
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| | | Forums66 Topics128,153 Posts1,056,842 Members48,456 | | 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 2004 Posts: 1,897 Shop Shark | | Shop Shark Joined: Dec 2004 Posts: 1,897 | Am I suppose to guess you are talking about a 59 1/2 ton?
If yes, you are limited to 3.90:1, or 3.38:1. As far as I know there is no Posi options available for the HO33 rear.
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