I HAVE A 2008 GMC ACADIA FWD WITH SERIOUS TRANSMISSION ISSUES. ABOUT 2 MONTHS AGO I HAD THE TRANSMISION REBUILT AFTER 3 FAILED VALVE BODY REPLACEMENTS . I INITIALLY TOOK IT IN FOR A TRANNY FLUSH THEY THEN TOLD ME THE OIL WAS DIRTY AND THAT I NEEDED TO HAVE THE VALVE BODY REBUILT WHICH THEY DID AND IT WAS WORSE SO AFTER 3 FAILED VAVLE BODY OVERHAULS THEY TOLD ME THE TRANNY NEEDS TO BE REBUILT WHICH THEY DID BUT THERE WAS STILL SHIFTING ISSUES SO THEY SENT IT TO THEIR TRANNY AUTOMOTIVE ELECTRICIAN AND HE REPLACED THE HARNESS AND ADDED A COOLER BUT AFTER 2 MONTHS IN THE SHOP I AM STILL HAVING SHIFTING ISSUES AND 3 TRANNY CODES ALL RELATED TO THE FLUID PRESSURE SWITCH...P0842 TRAN FLUID PRES/SWITCH A CIRC LOW … P0872 TRANS FLUID PRES SENSOR/SWITCH C CIRC LOW AND P0877 TRANS FLUID PRES SENSOR/SWITCH CIRC D LOW. MY QUESTION IS I AM STILL GETTING HARSH SHIFTS WHAT DO I TELL THE MECHANIC AND ARE THESE SENSORS /SWITCHES INSIDE THE VALVE BODY OR IS THERE A SINGLE PRESSURE SWITCH CONTROLLING THE FLUID PRESSURE IN THE TRANSMISSION....THANKS FOR ALL REPLIES AND BE SAFE