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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: Feb 2006 Posts: 150 Shop Shark | | Shop Shark Joined: Feb 2006 Posts: 150 | I have an SM420 and was told it's from a '55 Chevy. The top cover has a number 3830574 with a date code J11 5 (Yes, that's a space before the 5). The Tranmission case, on the drivers side has the number 3837334 with date code J6 5 (again, thats a space before the 5)
What is it?
What prompted this question is what I learned following the recent "SM420 Yoke" post. I didn't want to "ride on the post".
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