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| | | Forums66 Topics128,167 Posts1,057,020 Members48,458 | | 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: Nov 2013 Posts: 3 New Guy | | New Guy Joined: Nov 2013 Posts: 3 | I need a 4 speed transmission for my 1956 1.5 ton 4100 truck with the 235 six engine. Does anyone know the compatibility years for this transmission? I have access to a 1948 2 ton Chevy truck transmission and wondered if it would bolt up to my 56 truck? | | | | | Joined: Dec 2015 Posts: 2,063 Big Bolt Forum Moderator | | Big Bolt Forum Moderator Joined: Dec 2015 Posts: 2,063 | if they are both SM420 transmissions, it should bolt up. I am not sure if the 48 had an open drive shaft or not. You may need to change the rear bearing retainer plate that also holds the park brake. | | | | | Joined: Mar 2004 Posts: 6,233 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,233 | Per my Parts Books, Transmission Case casting number 591953 was used from 1948 thru 1963. Note, you may have to transfer your parking brake if it's different or not there. Mike B  | | | | | Joined: Oct 2009 Posts: 9 New Guy | | New Guy Joined: Oct 2009 Posts: 9 | I have a....
Last edited by Grigg; 01/29/2018 8:19 PM. Reason: please use PM or swap meet
| | | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | Private buying/selling should take place in email and/or Private Message. | | |
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