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four-speed
transmissions. The input and output shaft both changed from course spline
to fine spline. This carried over for all Muncie four-speeds. The identification
rings remained the same as the 1966-70, which had two rings on the input shaft
to designate the wide ratio gearbox. The output shaft now required a yoke
similar to the turbo 400 yoke, although it was slightly shorter than the automatic
yoke. All of these changes were carried through the 1974 model year.
Identification
Rings
All
original Muncie transmissions have identification ring grooves on the input
shaft and on the corresponding counter gear. These rings allowed the Muncie
assembly line workers to identify which input shaft and counter gear they
needed to install. The original ring groove for each transmission is shown
in the charts. Many transmissions have had the input shaft replaced so this
should not be used for positive identification of the transmission. The following
photos illustrate the ring grooves for all factory Muncie transmissions.
