SUSPENSION PACKAGE OFF - ROAD includes 1.81» (46 mm) shocks off - road jounce bumpers stabilizer bars (NZZ) Skid Plate Package and Z71 decals on rear quarters (tynanspreowned.com)
The Sierra HD front suspension now uses a pair of urethane jounce bumpers on each side, instead of one, for improved load management; and there's a new upper shock mount attachment design that's positively connected to the frame with two fasteners. (topspeed.com)
The ecoFLEX models also get softer jounce bumpers in the rear. (topspeed.com)