Could be the input shaft pilot bearing in the flywheel also. A worn one will allow the input shaft to be out of alignment and at a slight angle to the mainshaft which can cause the engaging clutch teeth to walk out of engagement.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.