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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!
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| | | | Joined: Aug 2012 Posts: 131 'Bolter | | 'Bolter Joined: Aug 2012 Posts: 131 | While in the process of rebuilding my 1949 1/2 ton truck I found large chunks of metal (2 that were between 2 and 3 inches long and in a ring shape) in the bottom of the transmission. The transmission is a sm-420 of the 1949-1950 period(not sure of the year but the input shaft does not have the oil lip seal).
After opening the transmission it looks like the metal in the bottom is the second speed gear synchronizing ring retainer, as it is missing.
I was wondering if anyone had any suggestions of what could have caused the ring to fail and what other components I should investigate more closely as a result. Also is there cheap sources for these (are they a standard part?) besides going the Novak route?
Thanks for any comments/suggetions
| | | | | Joined: Sep 2006 Posts: 3,596 'Bolter | | 'Bolter Joined: Sep 2006 Posts: 3,596 | Parts come up on eBay NOS. As to failure it is 64 years old and probably on its original build. For second gear if I had to hazard a guess low oil or tar and a forced shift. Your best bet would be to source another SM-420 they are rarely more than $100-150 anywhere. | | | | | Joined: Aug 2012 Posts: 131 'Bolter | | 'Bolter Joined: Aug 2012 Posts: 131 | Thanks for the input Brad. It seems like that retaining ring would be very hard to break without major damage to other components but eveything else looks good. Im gonna go ahead and see if I can locate a retaining ring that size somewhere | | |
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