The first Z car 5 speeds had the 5th gear behind the center plate and the main case. Reverse gears were behind that. 4th gear just locked the imput shaft to the main shaft and it was direct drive. The counter shaft did not even need to be in the case for 4th to work. My doctors D21 pickup sheared the key off the front counter shaft gear to the input shaft. He made it to the shop using only 4th gear.
regards
Mech
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