700r4 (or 4l60e) trouble 4-3 downshift
I have a Chevy K10 with a Certified Transmissions rebuilt 700r4/4l60e. I have put about 20,000 miles on it and then towed a 4Runner on a car trailer. Not knowing any better I used OD. After towing, the transmission shifts just fine, but once I start climbing a hill with the cruise set, it will try to downshift to 3rd but will make the truck shake and surge until I let off the throttle. The internet doesn’t give me a definite answer so I’m coming here!