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Click on image for the lowdown. 
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| | | Forums66 Topics128,017 Posts1,055,338 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: Mar 2010 Posts: 1,660 Curmudgeon | | Curmudgeon Joined: Mar 2010 Posts: 1,660 | I would take the truck back to the transmission shop. Explain the problem. You don't want to let any warranty pass you by.
I'm not up on the SM420 but it could also be a problem with the shifter fork or related part.
It doesn't hurt a thing to discuss the problem.
"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."
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