M22,
there were several 1965 Corvettes that were equipped with this new gearbox for
special order racing applications. Chevrolet just added many of these transmissions
to the vehicle's build manifest prior to delivery. New documentation found by
this author has proven that 57 1965 M22 transmissions were built. The first
was built on 4/15/65 with the first shipment from the Muncie transmission plant
taking place on 4/19/65.
The
only other change to the 1965 Muncie transmission was the moving of the assembly
date code to the rear face of the transmission main case (right side). This
change was brought about as a result of the new 1965 Protect-O-Plate program.
This program required the assembly plant inspection department to record the
assembly date code that was stamped into the engine,
Driver side front view of experimental Muncie transmission built for the Corvette
Grand Sport racing program. Photo by Darrell Shepherd
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Experimental
Muncie Transmissions
During
the 1963 model year there were several special close-ratio Muncie four-speeds
built for the Corvette Grand Sport racing program. These transmissions were
the "forefathers" of the M22 transmission released in 1965. Although
the total number of transmissions built is unknown, all of those found and
verified have "0-" experimental casting numbers on the main case
and tail housing. In the following pictures, you can see many distinct differences
from a standard 1963 Muncie transmission, including a coarse spline input
with a very odd fine spline output. The tail housing is also very different
in that it has special strengthening webs cast into it. This is the only
verified example known to exist today.
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Rear view of experimental Muncie transmission, passenger side. Note the special
strengthening webs cast into tail housing (arrow). Photo by Darrell Shepherd
