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Does anyone know if there's a transmission that will interchange with one from a Powermate PFTT150B rototiller with the 173cc Kohler engine? If not, can someone suggest someplace that one might be picked up reasonably? Thanks.

A203821 is the part number, E-Replacement parts has a new one for $158.
Jacks has it for $143 https://www.jackssmallengines.com/jacks-parts-lookup/part/southland/a203821

Thanks for your reply, I was hoping to find one cheaper but I may have to go with that.