SM420    &    SM465's
The SM 420
the grand-daddy of low range
trannys, with a 1st gear of
7.06 to 1. most easy to identifiy
by the large lump on the
passengers side, as seen in
this picture.

it's also very short,
making it a good swap into
a Jeep.
Chevy  SM420 with the mounted spicer PTO
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