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Mod | | | Forums66 Topics128,180 Posts1,057,164 Members48,465 | | 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: Mar 2004 Posts: 6,236 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,236 | At the end of the day, both the 3 and 4-speed transmissions have the same 1:1 hi gear, so nothing is really gained speed wise. The SM-420 just gives you a really low Granny gear for pulling/hauling a load up a hill. Mike B  | | |
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