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Mod | | | Forums66 Topics128,042 Posts1,055,505 Members48,424 | | 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!
| | THANKS!
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 | A quick calculation of the engine RPM at that speed, would put
it at about 11,720 rpm. My guess would be that if you were
able, somehow, to get the un-synchronized gears to line up...
in any AD with a stock rear gear and an SM420 from 3rd to 1st,
you would be picking scattered engine parts out of the hood.
dg
Denny G
Sandwich, IL
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