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| | | Forums66 Topics128,090 Posts1,056,345 Members48,442 | | 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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| | | | Joined: Aug 2011 Posts: 149 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2011 Posts: 149 | sorry guys I tried search,no luck.are the out put shafts enter changeable 3 speed to 4 speed?. | | | | | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | This site covers trucks from the '20s to the '70s. There were several transmissions used during that period. | | | | | Joined: Aug 2011 Posts: 149 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2011 Posts: 149 | you are so right cletis.i should have had been more spific.the 4 speed is sm420 out of 66 chev long bed,the 3speed is referred to,as mk1.used in 60s&70s cheverlets car &panels. atleast that is where I got mine,1955chev panel.thank everone.. | | | | | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | If you are asking if the output shafts are the same part on the
3 and 4 speed transmissions, I'm sure they are not. If you are
asking if the spline is the same I'm sure they are.
DG
Denny G
Sandwich, IL
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