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Trans difficult to get out of gear; hard/grinds going into next gear.
I have 1956 F100 with a 223 and a light duty 3-on-the-tree and starting a week ago for the first time ever it did a very odd thing. It felt like it was stuck in gear and of course I would shove it out of gear and when going to whatever next gear I was looking for, it would either act like it was "blocked" or it would grind quite a bit. I figured maybe the oil was old so I changed it(to 80-90, not remembering what I last used. It hasn't made it better.
The other issue is that it is rather random. It's only now done it three times for the last week--ever. Tonight when off of work, it did it the most times it has done it in a short period, however once I got it warmed up a bit it seemed to not do it.
On the 2 mile trip to the bank, it did it 10-15 times. On the mile trip from bank to grocery it did it only while leaving the bank, never again. On the 6-8 mile trip from grocery to home it didn't do it at all.
I'm guessing a slew of things:
clutch not disengaging; clutch only has 30-35k miles, ten years old, no clutch slippage.
trans linkages were briefly checked while doing oil change, everything seemed perfectly normal.
Does it have a ball-bearing pilot, or the bronze oilite bushing? Sounds like a pilot that is on the way out, or the disc is hanging up against the flywheel.
I **believe** it either has a brushing style pilot, or no pilot at all. If it doesn't have a pilot , it is because that's how I found it upon disassembly. I think it's the bushing though.
It sounds to me as if the clutch is not disengaging. Check the pedal free play. If there is excessive free play the pressure plate will not release from the disc and will keep everything spinning and that will result in the things you described. It could also be as Ross stated but I honestly have not seen that to be a very common thing. Also check to make sure your linkage has not become bent or messed up somehow as this would also keep the disc from becoming free between the flywheel and pressure plate.
At idle, when you disengage the clutch, if 1st or reverse grinds when selected either the pilot or the clutch is dragging. If the engagement point of the clutch seems normal to you, then it's probably the pilot. Good News: The trans and clutch on these things take about an hour to remove.