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Click on image for the lowdown. 
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| | | Forums66 Topics128,120 Posts1,056,649 Members48,450 | | 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: Apr 2023 Posts: 24 'Bolter | | 'Bolter Joined: Apr 2023 Posts: 24 | I’m having trouble identifying my bus transmission.
Stamping on the right rear:
3-12-57
NP C 91171
AL
It’s a 5 speed, cast iron case, maybe aluminum top.
Any ideas? | | |
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