Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Hello, my name is Bobby. Thank you for the question. Can you tell me how the fluid looked in the transmission? Is the check engine light coming on in the truck?
Thank you. It sounds like you may have an issue with the vehicle speed sensor or a valve body issue. It is very common for the valve body case to warp and at times cause binding in the valves. It is very hard to diagnose. I have also seen a dirty air flow sensor cause this. I would remove and use air flow cleaner to clean out the MAF. If that does not help I would replace the speed sensor before going further into the transmission.