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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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#51303 10/19/2005 3:46 AM | Joined: Sep 2005 Posts: 254 Shop Shark | | Shop Shark Joined: Sep 2005 Posts: 254 | i don't really have an answer for pretty much all your questions cause i don't have a clue with all them letters and numbers but my guess if you trans is a 4 speed that its a SM420 was told that 1967 and earlier 4 speeds were the SM420 and 1968 and after 4 spees were SM465
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