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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: Dec 2015 Posts: 2,062 Big Bolt Forum Moderator | | Big Bolt Forum Moderator Joined: Dec 2015 Posts: 2,062 | The transmission in my 58 2-ton is slipping out of 2nd gear. I am looking for a replacement (assuming I have some parts worn that are not included in a master rebuild kit) My question is, does the SM420 case out of a 1/2 ton have all the mounts for the park brake setup, or was there a difference in the case used on the different tonnage trucks? (I am assuming they are all the same case, and I can just replace the rear yoke with my park brake hub and yoke and bolt the rest of the linkage up. | | | | | Joined: Mar 2004 Posts: 6,212 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,212 | Mike, There are different Main Case casting numbers throughtout the life of the SM-420 that I can't explain. Could be when internal bearings changed sizes or if they added a threaded bolt hole for a bracket...who knows? That said it looks like the rear bearing retainer should bolt on to the same vintage case... Mike B  | | |
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