hi Dale, The torque limiting clutch disc is #E8NN7A539AA, only from New Holland--no aftermarket support for Select-O-Speeds. The quick fix is to weld the hub to the disc: Center the hub, level it across in the same plane, add reinforcing pieces or cut a complete ring to fill gaps as required (1/8" thick, 1/4", whatever). Just don't allow the reinforcement to intefere with the pressure plate or flywheel. To prevent too much disc warpage by the heat, stitch weld back and forth across the hub, like torqueing lugnuts. MIG is best. You're into the tractor righteous--I'd stick it back together and see what you've got. You've probably noticed minimal wear or the facings--the disc only slips to absorb shock. The splines will have to be dealt with sooner or later. The input shaft isn't available, so the standard fix is weld build-up and remachine. New hub splines would be immediately boogered up by the worn shaft splines--in my opinion, it's both or none. My guess is $400-$500 all told.Common wear parts for the SOS are available: Soft parts--o-rings, gaskets, seals-- clutch discs, etc. Like the 5-speed and the rest of the tractor, lots of hard parts (gears and shafts) aren't available. If you decide to pull the input shaft for repair, read the link discussion, paying speshul attention when Texadian tells about the thrust washer. The only advice I've got is to pop for a New Holland service manual. Dan Robertson has dealt with the TLC and may come along with some details.
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