First you have to take off the wipers arms. then remove the two end caps for the center air inlet grille and then the center grille. Remove the 4 bolts that hold the wiper transmission and a support brackett and remove the tranmission/motor assembly. You then have to seperate the drive link arm from the transmission and remove 2 more bolts holding the motor to the transmission. You should have a special tool to seperate the drive link but it can be done without one if your careful. Hope this helps
Do not buy American. GMC should recall this wipers issue because are many, but since no one is getting kill because of the wipers, they dont care. I own a 2003 yukon xl w/ 32k and is trash. GMC want to sell vehicles like candy and this what they are "candy"