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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!
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#81243 08/08/2007 5:12 PM | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | Jerry’s pretty much got it covered Keith. I would just add that your Muncie SM420 has a 7.05:1 first gear, not much that a change in rear end is gonna do to help that. The later four speeds would have first gears up in the 4.xx:1 range. Take a look at this site for some very good information on the transmissions that we see in these old trucks: http://www.novak-adapt.com/knowledge/sm420.htm http://www.novak-adapt.com/index.htm Denny Graham Sandwich, IL
Denny G
Sandwich, IL
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