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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.


SM465 side view

 

SM465 Identification

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.

 
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