Lifting a GMT800 Silverado (1999–2006) is one of the most common modifications on the platform — these trucks have excellent aftermarket support and respond well to everything from a 2-inch level to a full 6-inch suspension lift. Here’s what actually works at each level and what to avoid.
New to the platform? Start with the GMT800 buyer’s and owner’s guide for the broader context — engines, best years, common problems, and the inspection checklist — before committing to a build path.
GMT800 Suspension Basics
The GMT800 runs a torsion bar front suspension with a solid rear axle on leaf springs. This is important: front lift comes from torsion bar adjustment (for small lifts) or UCAs with longer torsion bars / coilover conversion (for larger lifts). Rear lift uses add-a-leafs, blocks, or a new spring pack. This is fundamentally different from the K2XX and T1XX which use coil-over fronts — the GMT800 is simpler to lift at budget levels but has different limits.
Leveling Kit (1.5–2.5 inches front) — Budget: $30–150
The cheapest and most common GMT800 modification. Torsion key cranks or a dedicated leveling key kit raises the front to match the rear rake. Stock torsion bar keys are adjustable — cranking them up 2 turns gives about 1.5–2 inches of lift. A dedicated aftermarket torsion key kit (Rough Country, SuperLift, ReadyLIFT) replaces the stock keys with a more aggressive drop-bracket design for a cleaner 2–2.5 inch level at $60–120. Tire fitment: up to 265/70R17 (31.6-inch diameter) without rubbing on most GMT800s.
Important: cranking stock torsion bars beyond 2 inches causes premature wear and degrades ride quality. Use aftermarket keys for anything over 1.5 inches. Always get a front alignment after any torsion bar adjustment.
2-Inch Leveling Kit + Rear Spacer — $100–250
Add a 1–1.5 inch rear block or spacer to match the front level for a truly flat stance. ReadyLIFT and Rough Country make simple bolt-on rear spacers. This combo fits 265/75R17 on most GMT800 1500s and 285/70R17 on some with minor trimming. The cleanest and most affordable “complete” lift for a daily driver.
4-Inch Suspension Lift — $400–900
A quality 4-inch lift on a GMT800 requires longer upper control arms (to restore correct geometry), torsion bars, and rear blocks or add-a-leafs. Rough Country’s 4-inch GMT800 kit ($400–500) is the budget choice — it gets the job done but uses cast components. Superlift and BDS Suspension make quality 4-inch kits at $700–900 with better geometry control and higher-quality hardware. At 4 inches, 33-inch tires (285/70R17 or 33×12.50R17) fit cleanly on most GMT800s with stock UCAs if using proper geometry kits.
6-Inch Suspension Lift — $900–2,000
The maximum practical lift on a GMT800 before major fabrication. A quality 6-inch GMT800 kit includes new upper control arms (mandatory at this height — stock geometry becomes dangerous), new torsion bars or a coilover front conversion, rear blocks or new springs, brake line extensions, and sway bar drop brackets. BDS Suspension, Fabtech, and Skyjacker all make solid 6-inch GMT800 kits. At 6 inches, 35-inch tires (315/70R17) fit with minimal trimming on most GMT800s. Plan on replacing upper ball joints and inner/outer tie rod ends at the same time — these items accelerate wear under a lifted geometry.
What Tires Fit
Stock: up to 265/70R17 (31.6-inch). 2-inch level: 265/75R17 (32.1-inch) comfortably, 285/70R17 (32.7-inch) with minor trimming. 4-inch lift: 33-inch tires clean. 6-inch lift: 35-inch tires with minor trimming.
Alignment After Lifting
Always align after any lift — caster and camber change with every torsion bar adjustment. A quality 4-wheel alignment at a shop familiar with lifted trucks runs $80–120. Don’t skip it — misaligned lifted trucks wear tires rapidly and handle poorly.
For overall GMT800 platform info: GMT800 buyer’s and owner’s guide and the GMT800 platform reference. For the general Silverado lift kit overview: Best lift kit for Silverado. For wheel fitment after lifting: Best wheels for Silverado.
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