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SM-465

Chevy SM465 front Chevy SM465 side Chevy SM465 back (Chevy SM465 before conversion)

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 bell housing 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.