-in case you might be interested here's a short story about how I "slickshifted" 3rd & 4th gear on the super T-10 that we ran in Zupans #1727 G/fmr.
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SLICKSHIFTING A T-10 4 SPEED
-explaining the process of doing 3rd gear, the inner teeth of the sliding synchro collar and set up of the main clutch shaft
-this is done in a milling machine.
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CUTTING 3RD GEAR
1-mark every other tooth , 18 out of 36, to be cut away.
2-use a 1/4” carbide burr with a rounded nose.
3-rpm of mill can be 750 to 1000rpm.
4-bolt 3rd gear to mill table and align one tooth to endmill.
5-set the stop to the bottom of the tooth, leave quill clear down for set-up.
6-start the mill, with the quill clear down, run the burr to just touch the tooth, set digital X-axis travel to zero or use a dial
indicator to measure the X-axis table travel.
7-raise the burr and advance the tooth in .015” steps and plunge the tooth until you get to .115” which removes the tooth.
8-then sweep back and forth slightly to clean a flat surface without touching the adjacent teeth.
9-takes about 40 minutes to do 18 teeth on 3rd gear.
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CUTTING THE INSIDE TEETH OF THE SLIDING SYNCHRO COLLAR.
1-same basic setup procedure.
2-clamp with collar to the mill table with a large diameter thick washer that has a notch cut out so you can view the teeth to
be cut, and recess the bolt head into the washer.
3.plunge .320” deep and use .015” increment plunges to remove .104” (instead of the .115” removed from the gear).
4.takes about 30 minutes for each side of the sliding collar.
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SETTING UP THE MAIN CLUTCH SHAFT GEAR
1-mount the drive gear shaft into a large vise using special v-block clamping aluminum jaws.