LT 180 K46
Thought I would post this as it may be worth a try for someone having K46 tranny problems.
Bought LT180 new in 2003. This tractor is used to mow 2 acres of some pretty rough mountain ground with some steep grades. I never pulled a cart or anything with it. Doing PM on it, I changed tranny oil @ 228 hours using 10W-30 Mobil 1 which at that time Tuff Torq was recommending 10W-30. Tranny was losing pulling power so I changed the tranny oil again @ 538 hours using 5W-50 which is what Tuff Torq was now recommending. That only made it worst as it would hardly move & the tranny made a howling noise. At that time I bought a used 2004 GT235 with less than 400 hours on it.
Figuring I have nothing to lose, I tore the tranny apart and found some grooves in the valve body & rotors. They were no more than .002 deep so I took some real fine emery cloth & put it on a surface plate and polished the surfaces until the grooves were removed. Put a new filter in & filled with 5W-50. I now have over 50 hours on the rebuild & I believe it is as strong or even stronger than when new. Keeping my fingers crossed.