z71's can be 2x4. z71 is just a package not the actual 4x4 drivetrain
Never seen a z71 2x4
98 gtp sedan forest green ,S1X intense cam,Intense pcm,Magnaflow exhaust, ubend delete,TEP trans 3.29's,3.4 smoothflow mps,Dyno'd 281hp and 371ft #'s of trq at the wheels http://www.cardomain.com/ride/3338681