1996 GMC Yukon Owner's Manual - Page 50

To move the height adjuster down, pushin at the word PRESS and move the height adjuster to the desired position. You can move the adjuster up just by pushing up on the shoulder belt guide. After you move the adjuster to where you want it, try to move it down without pushing in to make sure it has locked into position. Adjust the height so that the shoulderportion of the belt is centered on your shoulder. The belt should be away from your face and neck, but not falling off your shoulder. 2-Door Utility and Suburban 1-42