Do you have the bypass box (manual shifting switches)? The machine should have one with it. If so try that and see if it shifts properly, if it shifts properly with controller bypassed check trans speed sensors, should generate ac voltage, if good bad controller. This assumes your machine has the same powertrain as a THDH350
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.