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Click on image for the lowdown. 
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| | | Forums66 Topics128,077 Posts1,055,932 Members48,430 | | 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 2013 Posts: 1,384 Shop Shark | | Shop Shark Joined: Jan 2013 Posts: 1,384 | Does anyone have a chart for rpm /speed for a 2 speed rear axle? I was sure I saw one somewhere but I have been through the 48 spec manual and the owners manual and haven't found one. With 8:20 x 20 tires
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