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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,162 Posts1,056,942 Members48,458 | | 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: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy Tramp, the standard duty three speed (four bolt side cover) o.e.m. p/n for the rear seal is 3871649 = Napa NOS15041, or National 9613S
the heavy duty three speed (more than four bolt side cover) o.e.m. p/n for the seal is 3769588 = Napa NOS22340 or National 471341, hope that helps. | | |
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