Posted by DoubleO7 on May 24, 2018 at 12:43:31 from (72.187.160.102):
In Reply to: Help Identify posted by vicinalvictor on May 24, 2018 at 08:51:02:
Found this referencing the top casting number:
"GM & CHEVY SM420 TRUCK 4 SPEED 1948-1967
This transmission can be identified by a cast iron case length of 10-1/2". The casting numbers on the side of the case should be GM3761930 or GM3813389. The transmission has a shift cover that bolts over the top of the transmission
that has a shift cover part number of GM591568.
The P.T.O. opening is on the left hand side of the main case and the transmission has a non-synchro first gear."
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