Tuesday, February 15, 2011

Analyzing the Shift Mechanism II

EDIT: Added the measurements to the drawings.

Some drawings of the homemade shift mechanism to allow floor shifting a 3 speed transmission made to be a column shifter (Slang - Three on the tree)  ........

.........for you young pups not familiar with old cars this looks like an automatic lever coming out from your steering column that is actually used with a clutch. My transmission (55 Plymouth) came from the factory as a column shift and someone converted it to a floor shift when they put it in my 35 Ford.

I have found after market shifters from various companies for 56 and up but nothing for the 55.  So I am going to have to fix the current set up.

Click for large picture.


The "not so common" feature" of this trans mission is that there is a lever that, while pushing the shift lever to the left it pushes one linkage that sets the transmission up for reverse (left and up) or first (left and down) .... 

When the shift lever is not in first or reverse, a spring pulls the linkage for reverse and first back into normal operating position for second (right and up) and third gear (right and down).

       
[R        2]
 \____/
 /         \
[1         3]

You can study the pictures above and have a better understanding of how this works.

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