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Click on image for the lowdown. 
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| | | Forums66 Topics128,119 Posts1,056,313 Members48,439 | | 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: Jun 2011 Posts: 1,901 Shop Shark | | Shop Shark Joined: Jun 2011 Posts: 1,901 | FWIW, there was a similar black foam type of material in my doors at that location as well. It ran the distance of the support bar but was only about 1" wide (the width of the bar). I just figured it was there to help reduce some outer skin vibrations.
The doors also had the tar paper vapor barrier Bill mentioned.
Oakland built Jimmy...
Give me ambiguity
or give me something else
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