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7 members (Buckeye998, tclederman, JoergK., Gray_Ghost, carbking, 32Fordpuchoptop, 1 invisible),
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Mod | | | Forums66 Topics128,192 Posts1,057,358 Members48,469 | | 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: Jan 2011 Posts: 23 New Guy | | New Guy Joined: Jan 2011 Posts: 23 | its a manual 4 spd it has the basic 1-4 in a H pattern but when you go into neutral and slide it left and down it is reverse.
what transmission do i have??
thanks Jake. | | | | | Joined: Jan 2008 Posts: 4,963 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,963 | It would be GM's own SM420 4 speed. Its a very reliable transmission that was used for almost 20 years. | | | | | Joined: Jan 2011 Posts: 23 New Guy | | New Guy Joined: Jan 2011 Posts: 23 | thanks crenwelge for the info. i know first gear is something very low since i got 8 mpg out of first and i got to 16 in second gear | | | | | Joined: Apr 2005 Posts: 926 Shop Shark | | Shop Shark Joined: Apr 2005 Posts: 926 | My '54 GMC 2 ton,in low in both boxes and the axle,is good for 1/2 mph at redline. ;)But,yeah-you have the SM420;I like that box a LOT better than the 435 or 465,but around here you have to fight the off-roaders for 'em.
Speed | | | | | Joined: Feb 2012 Posts: 36 'Bolter | | 'Bolter Joined: Feb 2012 Posts: 36 | Sm420 has the lowest 1st gear ratio of all the medium duty 4 speeds, 7.05-1. Had one in a Jeep! | | | | | Joined: Apr 2005 Posts: 7,441 Bolter | | Bolter Joined: Apr 2005 Posts: 7,441 | You must be bored this morning. 
Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)
| | | | | Joined: Jul 2004 Posts: 2,995 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 2,995 | | | |
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