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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: Jul 2014 Posts: 1,291 Moderator for Tons o' Fun , Co-Moderator Driveline Forum | | Moderator for Tons o' Fun , Co-Moderator Driveline Forum Joined: Jul 2014 Posts: 1,291 | 54 Belair - What you have is GM 3688585 , Main Shaft with 22 teeth (11/22/10) for SM420, 1948-1949 before 6-1-49 when they made an improvement and switched to an 11 tooth design ( 11/11/10) and also changed the 1st and reverse gear on the mainshaft. Part number 3688585 superceded to GM 3692608 Main Shaft and that is the correct part number you will need for 1949- 1967 (unless you have a 65-67 1 1/2 or 2 ton truck trans) You can also use Borg-Warner part number WT250-2A. Hope that helps, pm me if you have questions or need help finding the part you need. I may be able to help.
Last edited by Dusty53; 10/20/2015 8:06 PM.
Ron - - Dusty53 1954 Chevy 3604In the Gallery Forum "You can't dance with the Devil and then wonder why you're still in Hell."
"They will forget what you've said, and they will forget what you have done but they will never forget the way you made them feel." | | |
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