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Click on image for the lowdown. 
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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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| | | | Joined: Dec 2015 Posts: 2,062 Big Bolt Forum Moderator | | Big Bolt Forum Moderator Joined: Dec 2015 Posts: 2,062 | easiest way to differentiate between SM420 and SM465 is the 420 only has one PTO outlet (driver side) and 465 has it on both sides.
Later versions of the SM420 had two horizontal ribs cast into the passenger side of the case so, just because it has some ribs on it, does not mean it is not an SM420.
The link Grigg posted has lots of info on these transmissions and how to identify them. | | |
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