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Click on image for the lowdown. 
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Global Mod,
Mod | | | Forums66 Topics128,143 Posts1,056,494 Members48,442 | | 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: Sep 2004 Posts: 36 New Guy | | New Guy Joined: Sep 2004 Posts: 36 | Prior to 1957, GM sent the 2x4's to several different shops for 4-wheel drive conversion (NAPCO was one of them). After that, NAPCO was selected as the supplier and GM ran them down the line with NAPCO 4-wheel drive components.
1959 Chevy Apache Stepside 4x4
2009 Chevy Silverado 2500HD Duramax/Allison LB Crew Cab
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