2002 4r100 pulling 12k trailer, trans seems to be slipping when it kicks out of overdrive or when I turn overdrive off. Not sure because I do not have a tach but It makes louder than normal spinning sound. didnt start until about 4 hours into a trip. trans temp never went over 190. I could power though it sometimes.
trans fluid is clean and doesnt have burnt smell. almost sounds as though it is going down to 2nd gear. Help?