you need to have the code pulled for us to further help you.

visually, check the fluid, look under the truck and make sure the sensors are hooked up
Roy

Answered by ASEMaster6371 (expert)
24,973 answers provided

Wheel sensor-Scan the computer to identify which ones-

Answered by rasmataz
68 questions asked

The most common failure on this vehicle by far is the speed sensor in the top of the differential.

Answered by Wrenchtech (expert)
14,829 answers provided