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Mod | | | Forums66 Topics128,014 Posts1,055,327 Members48,419 | | 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 | If you are talking about an SM420 4speed you gain nothing by
replacing the 3speed with it. The 1st. gear is almost unsuable
it's so low, which means you'll be driving it in 2nd, 3rd and
4th all the time. I'm sure you are aware that high gear in both
is 1:1.
The four speed will add 70 pounds to the truck and the stick
will be in the crotch of anyone sitting in the middle.
If your 3speed is broke, they're a simple transmision to repair
and with a little searching 'round parts are fairly easy to find.
Denny Graham
Sandwich, IL
Denny G
Sandwich, IL
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