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#46902 06/27/2005 1:43 AM | Joined: Dec 2004 Posts: 452 Member | | Member Joined: Dec 2004 Posts: 452 | The C174 would be the casting date code, and not the transmission ID code. March 17, 1964 would be correct for that. 3837334 is one of the casting numbers for the case of an SM420. The serial (ID) number would be stamped (not cast) on the rear of the case, toward the right side, just below the top edge (above output shaft). The Muncie 4-speed ID number should begin with an N.
Curt
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1953 Chevy 6400, 1957 Chevy 2dr Sedan
--"Mediocrity is easy, the good things take time"
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