880 clutch problems

I am looking for some help from anyone who has put a 310 gas in an 880. We bought a flywheel from a 1650 to bolt to the 310 crank, and used a button style clutch from a 1650 in order to continue to using the 880 bellhousing. The flywheel we bought was flat, so the clutch kit came with spacer washers for the pressure plate, to simulate a stepped flywheel. Everything bolted up fine, adjusted the fingers as directed, thought we were good. Put tractor under a load, clutch slipped. Engaged clutch, wouldn't come out of gear. Thought, not enough spring pressure, removed spacer washers, readjusted fingers. Couldn't get clutch to release, lengthened linkage until it would, but throwout bearing constantly against fingers. Releases now, but jerkily, and still slips when under heavy load. The strange part is it will slip, then catch again. I am baffled. Any thoughts would be fantastic.
Thanks
Adam
 
did you buy a rebuilt clutch disk? I put 1 in a c60 chevy truck years ago and the center of the clutch disk was broken- it would grab and let go then grab again. Napa replaced it and paid me for my labor to redo it.
 
Well did you get any numbers on the torque capacity of that clutch? The first 1750 we sold when they went to the button clutch form the fiber clutch would slip under some load conditions. Oliver had to change the springs so it would take the torque. A 1750 has a 310, a 1650 a 283 maybe you are at the torque limit!
 

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