Hi , I haven't been around here in a few years but I picked up a new hustler today , I think it's a bigfoot , it has the red kohler engine and roll bars gun racks and trunk rack but not sure anyway the previous owner didnt know what he was doing and filled the tranny up with gear oil and adjusted everything way out of wack so it goes forward with decent power and won't turn or back up , so what chemical to use to flush out the t20?