No u-joint. Has to be the clutch.
Did you install the clutch???
Did you cut the flywheel??
Did you get grease on new clutch and surfaces when you installed it, if you did??
Now that we have more info. Sure sounds like the clutch chattering.
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Dave
1968 Cougar
2004 Thunderbird
2007 F150 Harley-Davidson, SuperCrew
1986 LTD
1997 Ranger
1992 Honda Civic
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