Fluid is full smells good and is cherry red. No miss fires either. It did get a shift error 3-4 -40 but it isn't a hard code so not sure what that means
97 GMC z71
Out of the blue one day torque converter didn't lock up. Put a scanner on it there is no codes and its commanding lock up and there is no problems shifting what's so ever. I noticed there is a slight whine in park and neutral with kind of a clicking noise. Also clunks from same area...