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Mod | | | Forums66 Topics128,030 Posts1,055,428 Members48,422 | | 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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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Mar 2004 Posts: 6,214 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,214 | 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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