Question: are all z71 silverado 4x4?
Answer: While the Z71 designation was first introduced as Chevrolet's four-wheel drive system, in the early 2000s, it merely became a package name with a more off-road style and optional four-wheel drive. My mother owns a 2004 Colorado Z71 that is actually 2WD, but shares a visual package with a 4WD Z71 Colorado.