Living in the Past
SILVER Star
A bolt holding the bracket to the bell housing is missing, to the passenger side of the slave push rod.
The top motor mount puck is missing, likely the decision of the OP, since he used a short retaining bolt.
My vote is that the clutch fork is off the pivot ball.
Below is a picture of my '73 with original F engine, original rear bracket on original bell housing. If you sight down the slave cylinder/push rod, which goes straight into the fork, you can see the axis is more-or-less in line with the transmission cover screw coming out of the weld nut, just above the axis.
In the OP #1, second picture, the slave cylinder axis seems to be in line with the weld nut, but the push rod angles inboard to the fork. It may be a distortion due to camera angle, but it's worth checking out.
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Definitely a 3 speed fork. Stamped steel, pocket (not hole) for push rod, not a square boss for the tension spring hole as in the 4 speed fork. Definitely a 3 speed push rod. The 3 speed push rod has an 'acorn' style nut on the end that sits in a pocket stamped into the fork. The 4 speed push rod has a threaded end that extends through the 4 speed cast fork.
The nut is not butting up against the mount. The angle of the picture makes it appear that way, but the nut is fastened to the front bolt holding the slave cylinder in place. See the picture below:
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I knew what was wrong with the motor mount. The nut on the top without even a washer not a puck, castle nut and cotter pin I was surprised no one had mentioned it. Stood out like a sore thumb. Haven't paid that close of attention to the slave cylinder. So many possibilities with multiple parts that could be used.
I did check and statements about being a four speed change and 2F change are not support by dates of parts changes. Not sure when the slave cylinder changed to the passenger side. Pretty sure it was before 75. I know when the high low range for the transfer case was operated from the date the linkage pivoted odf the right motor mount. Like the fuel lines, brake lines and wiring are all run the opposite side of the exhaust to keep it away for the heat. Would have to check but believe my FJ25 clutch slave was on the right side. Believe Australia which vacuum shift was rare it was on the right side.