I HAD A TRANNY PAN SEAL LEAKING. I HAD IT REPLACED AND PUT NEW ATP-4 OIL IN IT. FOR WHATEVER REASON...EVERYTIME I'M SLOWING TO A STOP I GET A HARD DOWNSHIFT AT EXACTLY 30 MPH. ANYONE ELSE HAVE THIS HAPPEN? WHAT IS IT? THANKS!!!!!!!

 

Had that happen in my 01, but only in OD, not in OD no hard shift. Dealer reflashed the TCM and solved it