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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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#25407 02/06/2005 2:46 AM | Joined: Oct 2003 Posts: 5,152 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Oct 2003 Posts: 5,152 | The SM420 is a pretty tough transmission, but it was not designed for the kind of abuse a big block can hand out.
A friend of mine's dad ran a 396 in a early 60's 1-ton truck with an SM420 for years with no problems.
So my conclusion is that your success will depend a lot on how you drive it.
1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble... | | |
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