Re: Uncle Looking to buy a Z71!
I got a 2001 Z71 Ext. cab about 7 months ago. Not sure when the 3rd door became available, but I think the 4th door is standard in the 2000 models. The Z71 package includes a bigger air cleaner (may add a coupla horses), bigger shocks (which increases payload & towing capacity a little), skid plates, and the stickers of course. In the new models, Z71 also includes that fancy pro-tec composite bed & tailgate. The 5.3L Vortec is standard with LT trim level and optional with the LS or standard trims. The tow package is separate (option Z83, I think). 4.11 gears and locking rear are good options to look for too.