Thanks for the input. I thought it may be the clutch.Hello 8n_guy,
There is a small drain hole in the bottom side of the clutch housing with a cotter pin in it. Wiggle the cotter pin to ensure that the drain hole is open. You may have a plugged drain and some oil pooled in the clutch housing?? This oil (leakage) can be from the rear main seal of the engine or from the input shaft seal of the transmission. Clutches can get "grabby" if there is oil on the clutch disc. If the drain hole is plugged, run a small wire up alongside the cotter pin to open the drain.
If the drain is open, I suspect that you will have to split the tractor and replace clutch, pilot bearing, and throwout bearing.