I'm selling a 2004 silverado z71.
Super clean for its age, there are no issues with the truck. 
Built Transmission by big dog transmissions here in austin texas, roughly 3000 miles ago along with a new oil pump and timing chain. I have receipts for everything.
Automatic 4wd actuator motor just replaced and works flawlessly. Also brand new knock sensors. Hd converted front hood grill and bumper with new headlights and led bulbs. Boost auto color matched tow mirrors. 2016 step rear bumper color matched.
2015 gmc sport wheels.
Complete front end refresh (UCA/ball joints/inner and outer tie rods/Swaybar endlinks/ Pittman arm/idler arm/ wheel hubs/ all shocks)
The truck averages 15.1 mpg so it's pretty healthy. 
I also swapped out the rear seats to leather from an avalanche and center console.
Cons.
Roof is faded slightly
Small digs here and there nothing major.
Asking 12,000
Located in austin texas