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Labor Day Putting down your wrenches or time for
MORE wrenching? 
Plenty of places to share. | | Click on image for the lowdown. 
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| | | Forums66 Topics128,004 Posts1,055,246 Members48,418 | | 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 2005 Posts: 209 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 209 | I see posts regarding SM420 trans and maybe some others. I'm guessing that would be the stock trans in a 51, but could someone enlighten me about trans history, What was used when, for how long, were gear ratios changed in later years, or just the rear ratio to increase top speed. The 51 3104 I bought is 6 years older than me, but I'm feeling like when I was 16 and got a 49 F1, only better. This ones a BOWTIE!! John | | | | | Joined: Sep 2006 Posts: 3,596 'Bolter | | 'Bolter Joined: Sep 2006 Posts: 3,596 | | | | | | Joined: Mar 2005 Posts: 209 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 209 | Brad, thanks for that link. That answered my question, but raised another. Who built that tranny, GM or was it outsourced? John | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Brad, thanks for that link. That answered my question, but raised another. Who built that tranny, GM or was it outsourced? John At the link posted by Brad: The GM Muncie SM420 Transmission . A GM transmission built at the GM Muncie (Products) Indiana transmission plant. | | | | | Joined: Mar 2005 Posts: 209 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 209 | Duh, I didn't go deep enough in the link. I appreciate the patience of the people who are on this forum. There are times you can't see the forest for the trees when you are looking for info. Hopefully at some point I'll be able to help someone in their quest and return the favor. John | | |
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