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Click on image for the lowdown. 
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| | | Forums66 Topics128,095 Posts1,056,480 Members48,444 | | 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: May 2005 Posts: 334 'Bolter | | 'Bolter Joined: May 2005 Posts: 334 | I know there was a standard 3 speed and a heavy duty 3 speed, but did they have a number or designation like the SM420's? Who made them? | | |
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