YT48XLS transmission failing -- is there a heavier duty version that fits?

[Wild Turkey73]

Five years of hauling my significant self up a fairly serious hill while mowing the "north 40" has about done it in. It can still mow flat lands but only for a little while before it starts slipping so I'm debating replacement with heavier version or rebuilding the current trans and selling.

What do the other Husky riding mower owners think?