Hey, I presently have my nortrac nt254 split changing the clutch due to the exact slippage you describe. I caused my own problem due to not realizing I had over serviced the transmission. Once I realized it I drained it down but it was to late. Tranny fluid had drained forward/down the input shaft and dripped into the clutch housing area. Once it was there and I was operating the tractor then the oil got slung all over the clutch assembly. Had I realized that I had tranny fluid in the clutch housing area then I could have drained it out at the bottom of the housing. There is a drain plug there. I also had to order new both pressure plate discs due to heat cracks caused from my operating the tractor with the clutch slipping. The clutch slipping heated up the plate enough to cause the stress/heat cracks. I will be reassembling my tractor next week.