[Scrubcadet10]

When's the last time you replaced the drive belt?

Unfortunately you probably couldn't repair the trans as it appears a majority of the parts are No longer available. Through Sears/Craftsman at least.
Dana-transaxle d4360-140

https://www.searspartsdirect.com/model/ogybwil0jr-000247/craftsman-917270532-front-engine-lawn-tractor-parts

scroll through the diagram list until you come across Dana transaxle diagram.