TH400 not downshifting
86 Full Size Jimmy
Ok, Its a turbo 400 and ever since the mounds on sunday it wont downshift when coming to a stop at a red light, turn, etc. I can manually do it otherwise it will start out in third or second. Which ever gear it was in when i stoped. Whats funny is if i go to Neutral and back into drive it automatically goes to first gear with out going all the way down to first with the shifter. Anyone got any ideas? I was thinking modulator, but then again im no trans expert. Any help or opinions would be appreciated. I dont want to have to fix it when i get back from boot camp and its freezing out. Haha...