Upgrading the stereo in a 1999–2007 Silverado or Sierra is one of the best value mods you can do. The factory head unit is AM/FM only with no Bluetooth, no aux input, and no navigation. A double DIN swap fixes all of this.
WHAT FITS
- GMT800 trucks have a double DIN dash opening — any standard 7" double DIN head unit fits
- You need a dash kit to fill the gap around the head unit (Metra 95-3305 for most models)
- A wiring harness adapter connects the factory plug to the aftermarket unit
- Trucks with OnStar need an GMOS-LAN interface module to retain the OnStar system
HEAD UNIT OPTIONS
- Pioneer DMH series — touch screen, wireless CarPlay/Android Auto, backup camera input
- Kenwood DDX series — similar features, excellent sound processing
- Sony XAV series — good value option with CarPlay support
- Alpine iLX series — premium option with OEM-style integration
WIRING
- Metra 70-1858 is the correct harness for 1999–2007 GM trucks
- Connects factory plug to standard ISO connector on aftermarket head unit
- Retains factory amp if equipped (Bose)
- Add a Posi-Tap or Axxess GMOS-LAN if you want OnStar to keep working
BACKUP CAMERA
- Most double DIN units have a reverse camera input
- Run a camera to the license plate area — trigger wire connects to reverse light
- Pairs perfectly with a new head unit for safety