Why pay a dealership top dollar when you can easily replace your GMC shocks yourself? First, test your GMC shocks to see if they are showing signs of wear. Does the car roll or sway when you turn? Does the front end dive when you brake, or the rear end squat when you accelerate? Test the shocks by bouncing the car up and down at its bumper. If so, it's time for a replacement job. First, take time to heed practical safety measures. Position a block of wood or cement in front of and behind the wheels while working on the GMC shocks - so when you are working on the front shocks, brace the back wheels with a block, and vice versa. Make sure that the shocks mounting systems are smooth/ free of loose rust or dirt. Check your car owner's manual and the shock instructions for proper jack positioning - do not support the car entirely on jacks! Check your tools to see if you have the necessary items, which usually include a deep/ shallow 1/2 or 3/8 socket set, box and open-end wrench set, lug wrench, hammer, pliers, and torque wrench, hydraulic jack, two safety support stands and four wood or concrete blocks. And finally, use safety glasses when replacing your GMC shocks.