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BUSY BOLTERS Are you one?  The Shop Area
continues to pull in the most views on the Stovebolt. In August alone there were over 22,000 views in those 13 forums.
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| | | Forums66 Topics126,776 Posts1,039,271 Members48,100 | | Most Online2,175
Jul 21st, 2025 | | | | 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: 7,440 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,440 | 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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