I can give you my experience with the K46 trans. I wouldn't buy another mower with one.
I bought a Husquvarna LGT2554 from Lowe's in June of 2010 for right at $2500 tax and all. I have 105 hrs on pretty much all up and down hill mowing. After about an hour mowing, it will slowly lose power to the point that it will stop mowing uphill. If I let it "rest" for 30 min or so, it will be good for another 30 min or so before I have to stop and do it again. I talked to the local Husqvarna repair place and they stated it would be around $500 to replace it. Everything else about the mower is great. No rust, engine starts instantly, mows through even thick grass with no bogging down, but now it stops going uphill before I can get finished mowing the yard.
So it has basically cost me $40 every time I mowed my yard, by the time I factor in my labor and gas, it would probably have been cheaper to pay someone else to do it...:mur:
I am selling it to a friend who has a completely flat yard for $500 with him fully knowing what is wrong with it.
If you are going to be pushing/pulling stuff around that weighs anything, including yourself and the mower on any type of slope, you will probably want something more beefy than the K46. Don't get lured into a false economy, like I did. My new mower will specifically be ground implement rated, not because I plan on pushing/pulling anything because I have 2 ATV's for that. I am doing it because I don't want the transmission to be the weakest link.
Plus, it will be nice to ride something that doesn't sound like a jet winding up for takeoff under any type of load.:laughing: