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Click on image for the lowdown. 
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| | | Forums66 Topics128,110 Posts1,056,246 Members48,437 | | 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: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | Swapping the three speed for an SM420 four speed was very
common. The SM420 was a factory option for the 3100.
You've described the shift pattern for the SM420.
dg
Denny G
Sandwich, IL
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