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Chevrolet Silverado 1500 GMT800 (1st Generation)

1999–2006 · GMT800 · truck

The GMT800 launched for 1999 model year as the first truck wearing the Silverado nameplate, replacing the C/K. Available 4.3L V6, 4.8L LR4 V8, 5.3L LM7 V8 (the volume engine), and 6.0L LQ4 V8, all Gen III small-block (LS-family) iron-block Vortec. No Active Fuel Management on this generation; that came with GMT900. Classic body ran through 2006 for 1500s, with the 'Classic' badge sold alongside the new GMT900 into 2007. HD variants continued into 2007.

Watch out: Rust on cab corners, rocker panels, and rear wheel wells in salt-belt states is the defining issue. Owner reports of 4L60E transmission wear at 150k+ miles and intake manifold gasket leaks on early 5.3L LM7 are common.

What your Silverado 1500 takes

The parts and fluids that fit this generation. Specs we publish are confirmed against two independent sources; the rest fill in as we verify them.

  • Wiper blades22" driver · 22" passenger✓ VerifiedView
  • CoolantDEX-COOLFrom owner's manualShop
  • Oil filterParts in catalogShop
  • Engine air filterParts in catalogShop
  • Brake rotorsParts in catalogShop
  • Tire sizeNot catalogued yetFind yours soon
  • Engine oilNot catalogued yetFind yours soon
  • Cabin air filterNot catalogued yetFind yours
  • Spark plugsNot catalogued yetFind yours soon
  • Headlight bulbsNot catalogued yetFind yours soon
  • BatteryNot catalogued yetFind yours soon
  • Brake fluidNot catalogued yetFind yours soon
  • Transmission fluidNot catalogued yetFind yours soon
  • Tire pressureNot catalogued yetFind yours soon
  • Key fob batteryNot catalogued yetFind yours soon
  • Power steering fluidNot catalogued yetFind yours soon
  • Differential fluidNot catalogued yetFind yours soon
  • Serpentine beltNot catalogued yetFind yours soon
  • Brake padsNot catalogued yetFind yours soon
  • Wheel fitmentNot catalogued yetFind yours soon
  • ThermostatNot catalogued yetFind yours soon
  • A/C refrigerantNot catalogued yetFind yours soon
  • Fuel filterNot catalogued yetFind yours soon

Full clubhouse — owner Garage Lineage, common problems, year-by-year notes, and product picks — is on the build list.

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