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Click on image for the lowdown. 
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| | | Forums66 Topics128,155 Posts1,056,868 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: Mar 2006 Posts: 319 Shop Shark | | Shop Shark Joined: Mar 2006 Posts: 319 | I read that GM trucks through 69 use 2 lettters for the axle code. 1970 up use 3 letters. So its possible that you have a 68 C10 rear end according to this source http://www.gmcpauls.com/67-72_chevy.htm.TR = 3.07 03 = month 13 = day W = Warren, Michigan plant 2 = second shift
"Nothing astonishes men so much as common sense and plain dealing." - Ralph Waldo Emerson
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