The SM465 is the replacement for the SM420. It's first gear isn't
as low, but it has a sturdier case and uses a larger input bearing.
Input bearing retainer size may also be larger though, so finding a
bellhousing for anything other than a Chevy SB is not possible from
the junk yard. It is also a bit longer than an SM420 which may be a
concern for CJ-5 and earlier Jeeps.
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SM465 side view
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The SM465 has been used in Chevy trucks since the late 60s. The
following articles cover some things to look for to find the SM465 you
need.
GM SM465: Chevy used the SM465 from the late 60s until the 80s.
Onboard
Air
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