If you're going to open it up for the throwout bearing, satsop's idea on the pilot bushing is worth considering. IIRC, it's asimple bronze or maybe even an Oilite bushing in the center of the flywheel. It's intended to run without any additional lube, but if it gets crud into it (like dust in oil leaking from a rear main seal) it will get sticky instead of turning freely and cause the main shaft to keep turning, causeing the input shaft to turn even when clutched. One way to check that CAREFULLY without tearing down is to leave your PTO engaged and have a helper depress the clutch pedal with the motor running at a low to medium speed. If the PTO shaft is turning, it's likely the pilot bushing is gummed up. The CAREFUL part comes in when you try to see if slight resistance will stop the PTO shaft. Tractor off and in neutral, ignition OFF, either hold the shaft with your hand or hang a heavy pipe wrench off the PTO shaft and have your helper crank the motor on the starter only (Ignition OFF, no running!) and see if the shaft turns. Be prepared to let loose of the shaft or the wrench IMMEDIATELY if it starts to turn.
If it doesn't try to turn, it's likely a sticky pilot bushing making for the noisy shift. If it affirmatively turns, it may be that your freeplay is out of adjusment and the clutch is not completely disengaging when you press the pedal. If it's out far enough that the throwout bearing stays in contact with the clutch fingers, the growl could be what I described before, the throwout bearing beginning to go.
Normally, the bearing only turns when in contact with the fingers. When the clutch pedal is released, it should pull back to about 1/4" away from the fingers, not turning and therefore making no noise. A thoroughly bad throwout bearing will be noisy when pressure is applied. They will go out in different ways, but it is possible in the early stages for it to be quiet when away from the fingers, and quiet when taking the full pressure of the clutch fingers, but to growl and rattle some under intermediate pressures as the pedal is pushed and released.
Thinking on the lurching some more, though, and it being worse in reverse, it sounds more like one of the big ball bearings on the diff shaft or the axle. They can be a bugger to track down, as the noise runs all through the iron making it hard to pinpoint. Do you hear any kind of snapping or chunking sound when first changing directions, either forward or back, just before the growl starts?
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