I ran into a Ford (4000 series if I remember right)with the Selcto-Speed some years back that had a similar problem. Turns out they have a clutch disc between the flywheel and the tansmission that acts as sort of an over running clutch and can slip under the right set of circumstances. The tension on the disc is applied with some heavy bellville washers and isn"t adjustible. On the one I worked on the drive straps had broken between the center of the clutch and the outside ring allowing the outer (drive) ring to rotate around the inner (driven) ring that was connected to the transmission input.
I don"t know about your particular model but on that one the correct disc was no longer availavle. Seems the OEM did an update and changed the spline count on the disc. In order to accomodate this the input shaft on the transmission had to be changed. Unfortunately that shaft had been discontinued "long ago" and there wasn"t one to be found anywhere at the time. It was ultimately repaired by machining the center out both the old and new clutch discs and rewelding the center with the correct spline count into the new disc. That was like 5 or 6 years ago and the tractor is still doing fine.
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