Are Z71 silverado pickups always 4wd?

yes, Z71 is the designation for the "offroad package", inc. shocks and skid plates, etc. That is true, But make sure that someone did not just go down to a swap meet and buy Z71 stickers and just stick it on the rear quarter panels. I have seen many 2 wheel drive Silverados with the Z71 emblems on them because a lot of people think it makes there truck look " COOL ". The best to tell if it is a 2wd or 4wd is to look at the 5th letter of the VIN C=2wd K=4wd