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Click on image for the lowdown. 
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| | | Forums66 Topics128,042 Posts1,055,518 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!
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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 | 9 miles per hour with a 4.10 gear and 29" tires would
have put you over 3,000 rpm in low gear.
Double clutching the SM420 helps because the change gears are
quite massive and the synchro's are a little slow on the
up take. For this reason the synthetics don't really work to
well. That oil is simply to slippery for this transmission.
dg
Denny G
Sandwich, IL
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