GMT800 (1999–2006) – NBS Discussions

Exterior Body panels, grilles, trim, bumpers, paint, rust repair, and exterior lighting upgrades for 1999–2006 GMT800 NBS trucks and SUVs. Performance, Mods & Tuning Engine upgrades, bolt-ons, LS performance mods, headers, drivetrain upgrades, and PCM tuning discussion for GMT800 NBS trucks. Interior Interior repairs and upgrades for 1999–2006 GMT800 NBS Silverado, Sierra, Tahoe, Yukon, Avalanche, and Escalade, including Cat Eye models — seats, dash issues, gauge clusters, HVAC fixes, consoles, and interior lighting. Technical & Maintenance Diagnostics, repairs, maintenance procedures, common failures, torque specs, and factory-service technical discussion for 1999–2006 GMT800 NBS trucks and SUVs. Suspension, Wheels & Tires Lift kits, leveling kits, lowering setups, steering upgrades, and suspension builds for GMT800 NBS platforms. Stereo, Wiring & Electronics Head units, speaker installs, amplifier setups, wiring repair, gauges, remote start, and electrical troubleshooting for GMT800 NBS platforms.

Topic	Replies	Views	Activity
About the GMT800 (1999–2006) – NBS Discussions category GMT800 (1999–2006) – NBS Discussions	0	6	February 10, 2026
2004 Tahoe warm front driver and passenger but still cool in back Interior	4	26	September 18, 2026
GMT800 Tailgate Rebuild Guide – Cables, Hinges & Latches (Video + Parts) Technical & Maintenance	1	35	September 18, 2026
GMT800 Instrument Cluster Repair – Common Failures Technical & Maintenance gmt800-nbs , gmt800 , electrical , how-to , dash	12	210	September 3, 2026
Which GMT800 engine did you end up with — 4.8, 5.3, 6.0, or 8.1? Technical & Maintenance	2	27	August 25, 2026
Fuel Pump Replacement on GMT800 Trucks: Step-by-Step Technical & Maintenance	2	83	August 24, 2026
Pump rub check: who's opened their NP246 — and what did you find? GMT800 (1999–2006) – NBS Discussions	0	20	July 25, 2026
Fuel gauge lying to you? Sender or cluster — what did yours turn out to be? GMT800 (1999–2006) – NBS Discussions	0	10	July 25, 2026
Clicking in the dash — which blend door actuator was it, and how bad was the job? GMT800 (1999–2006) – NBS Discussions	0	22	July 23, 2026
Blower only works on high? Post your resistor and melted connector photos GMT800 (1999–2006) – NBS Discussions	0	12	July 21, 2026
2003–2006 owners: speedo stuck at 120? Post what fixed your cluster GMT800 (1999–2006) – NBS Discussions	0	9	July 21, 2026
8.1 Vortec L18 DBW Pinouts: 2001–02 vs. 2003–06 Harness Guide Stereo, Wiring & Electronics	0	43	July 12, 2026
GMT800 owners: what year would you buy today, and what would you avoid? Stereo, Wiring & Electronics sierra , silverado , gmt800 , buyers-guide	0	21	June 30, 2026
Don't Install Aftermarket GMT800 Headlights Until You Do This Stereo, Wiring & Electronics sierra , silverado , gmt800 , how-to , headlights , diy , avalanche	0	45	June 24, 2026
8.1L Vortec Spark Plugs: ACDelco 41-983 at .045" Gap — and What to Do When You Break Your Wires Technical & Maintenance 8-1-vortec , maintenance , gmt800 , spark-plugs	0	41	June 23, 2026
8.1L Vortec Startup Chatter Fixed: Ditched the 5W-30, Switched to Rotella T4 15W-40 Stereo, Wiring & Electronics avalanche-2500 , 8-1-vortec , maintenance , gmt800	0	27	June 23, 2026
99-02 GMT800 Double DIN Installation Guide – The Right Way to Do It Stereo, Wiring & Electronics 99-02 , audio , guide , gmt800-nbs , stereo , gmt800 , how-to	1	304	June 12, 2026
GMT800 4.8 / 5.3 / 6.0 Hot Idle Low Oil Pressure — Post Your Readings and Fixes Technical & Maintenance gmt800 , oil-pressure , engine , diagnostics	0	43	May 25, 2026
GMT800 Leveling Kit vs 6 Inch Lift – Ride Quality Comparison Suspension, Wheels & Tires	0	37	April 20, 2026
GMT800 Transfer Case Pump Rub Fix – NP246 Repair Guide Technical & Maintenance	0	16	April 20, 2026
4L60E Common Failures and What to Fix First (GMT800 Guide) Technical & Maintenance	0	53	April 20, 2026
5.3 vs 6.0 Engine Differences – LM7 vs LQ4 (GMT800 Guide) Technical & Maintenance	0	48	April 20, 2026
GMT800 Towing Capacity Chart – 1500, 2500, and 3500 (1999–2006) Technical & Maintenance	0	80	April 20, 2026
Show Off Your NBS Build! GMT800 Photo Thread Exterior	0	23	April 14, 2026
Front End Rebuild: GMT800 Ball Joints, Tie Rods & CV Axles Suspension, Wheels & Tires	0	80	April 14, 2026
4L60E & 4L80E Transmission: Common Failures, Symptoms & Fix Guide Technical & Maintenance	0	64	April 14, 2026
Best Amp for GMT800 Silverado – Power & Install Guide Stereo, Wiring & Electronics	0	32	April 12, 2026
GMT800 Subwoofer Box Build – Under Seat vs Custom Box Stereo, Wiring & Electronics audio , stereo , gmt800-nbs , gmt800 , how-to	0	58	April 12, 2026
Best Head Unit for GMT800 Silverado – Top Double DIN Picks Stereo, Wiring & Electronics	0	119	April 12, 2026
Best Floor Mats for GMT800 Sierra – Custom vs WeatherTech Interior	0	38	April 12, 2026