I have a rincon here and other than checking the oil pressure I really don’t know where to start. I don’t know a lot about the trans on these. Sometimes when you put it in reverse you can hold throttle very high and barely move, shift to forward and it works fine. I have only gotten it to do it once for me and that was when engine was cold, owner says it is random. Like I said, it doesn’t always do it. So kinda at a loss on where to even start..