Help please, 09 TYM T330 hydrostat with ratcheting sound from the rear.

[Harry in Ky]

What you describe here has no simple "it's going to be either this or that" type of problem. More details are needed. "Only skips under very heavy load". When it "skips" this is when the "ratcheting" sound appears? And this seems to come from where on the tractor? It pulls in 2WD without issue unless the "pull" is severe?

A quick search for online parts for TYM T330 comes up empty. Is that the correct model designation?