Best Lift Kit for Silverado: Leveling vs. Lift, UCA Requirements & Tire Sizing (GMT900, K2XX, T1XX)

A lift kit is the most visually impactful modification you can make on a Silverado or Sierra — but buying the wrong kit for your generation, trim, or use case is an expensive mistake. This guide covers the best lift kits for every modern generation of Silverado and Sierra (GMT900, K2XX, T1XX), what size actually fits each truck, when you need upper control arms, and how to size tires correctly after lifting.

Leveling Kit vs. Lift Kit — What’s the Difference?

A leveling kit raises the front of the truck 1.5–2.5 inches to match (or slightly exceed) the factory rear rake — the slight backward tilt most trucks have from the factory to compensate for payload. A leveling kit does not raise the rear. A lift kit raises all four corners — typically 4–6 inches — and includes new rear suspension components (blocks, add-a-leafs, or new springs). Know which you want before shopping.

• Leveling kit: 1.5–2.5″ front lift, no rear change. Allows 33–35″ tires on most 1500 trucks. Under $200 for most kits. Best for improved stance, mild off-road clearance, and daily driving.
• 3″ lift system: Usually front spacer/leveling + rear blocks. Requires UCAs (upper control arms) to maintain alignment. Allows 33–35″ tires. $300–$800 for the system.
• 4–6″ lift system: Complete front and rear suspension lift. Requires UCAs, extended sway bar end links, brake line extensions. Allows 35–37″ tires. $800–$2,500 for a quality system. Best for serious off-road builds.

The UCA Rule — When You Need Upper Control Arms

This is the most important thing to understand about lifting a GMT900, K2XX, or T1XX truck: any lift over 2.5 inches requires new upper control arms (UCAs). Here’s why. The factory upper control arm is designed for stock ride height geometry. At 3+ inches of lift, the ball joint angle exceeds its designed range of travel — this accelerates ball joint wear to the point where a ball joint can fail within 20,000–30,000 miles of a 3-inch lift with factory UCAs. You’ll also be out of alignment spec immediately, destroying your tires.

Quality UCA brands for Silverado: Cognito Motorsports, SPC Performance, Rough Country (budget), ReadyLift, BDS Suspension. Cognito is the gold standard — forged aluminum arms with heavy-duty ball joints and a solid reputation on the FSC forum.

Lift Kits by Generation

GMT900 (2007–2013 Silverado / Sierra 1500)

GMT900 trucks use a torsion bar front suspension — different from the coilover/strut setup on K2XX and T1XX. Lifting is done by adjusting the torsion bar keys (for leveling) or replacing them with aftermarket lift keys for additional height.

• Torsion bar leveling (1.5–2″): Cheapest option — a set of aftermarket torsion bar keys ($50–$100) gets the front up 1.5–2″ with a realignment. ReadyLift and Skyjacker both make GM torsion keys. Downside: factory torsion bars are now under more preload, which stiffens the ride.
• 2″ Leveling Kit with new CV boots: If the factory CV axles are high-mileage, inspect and replace boots when leveling — additional angle accelerates wear on already-tired axles.
• 4–6″ GMT900 Lift Kit: BDS Suspension, Rough Country, and Zone Offroad all make GMT900-specific systems. BDS is the preferred choice for quality — their 4″ system includes new UCAs, extended sway bar end links, and front coil spacers with Bilstein shock recommendations. Allows 33–35″ tires on most wheel/offset combinations. Zone’s 6″ kit allows 35″ tires but requires additional modifications for full droop clearance.

For complete GMT900 platform info see our GMT900 Complete Owner’s Guide.

K2XX (2014–2018 Silverado / Sierra 1500)

K2XX trucks switched from torsion bars to a coilover/strut front suspension — the same basic setup as cars. Leveling kits use strut spacers (billet aluminum pucks that sit on top of the factory strut). This is a simpler system than torsion bar adjustment but the UCA rule still applies at 3+ inches.

• 1.5–2″ Leveling Kit (no UCAs needed): ReadyLift 66-3085, Rough Country 1330. Direct bolt-on to factory strut towers. Allows 275/65R18 or 285/65R18 without rubbing on most 18″ wheel configurations. $60–$150. Best first mod for K2XX owners who want stance without complexity.
• 3″ Leveling (UCA required): ReadyLift 3″ kit with Cognito or SPC UCAs is the most popular combo. Allows 285/70R17 or 285/65R18. Total cost: $600–$1,100 with quality UCAs.
• 4″ Lift System (BDS, Rough Country, Zone): Full front strut spacer + rear block system with UCAs, extended sway bar links, and brake line extensions. BDS 4″ K2XX kit with Bilstein shocks is the reference setup on FSC. Allows 295/70R18 or 305/65R18 depending on wheel offset. Factory 20″ wheels need a mild offset (0–12mm outward) to avoid rubbing at full droop.
• 6″ Lift (Rough Country, Fabtech): Significant fabrication complexity at this height on a K2XX. Requires new rear leaf springs (not just blocks), UCAs, brake line extensions, sway bar extensions, and possibly front differential drop. Best for dedicated off-road builds only. Allows 35–37″ tires.

For complete K2XX platform info see our K2XX Complete Guide.

T1XX (2019–Present Silverado / Sierra 1500)

T1XX uses an independent rear suspension (IRS) on the Silverado 1500 — the first full-size Silverado with IRS. This fundamentally changes what a rear lift looks like: no more rear axle to block-lift. Rear lift on T1XX requires coilover spacers or replacement coilovers. Front is a familiar strut setup.

• Trail Boss (factory): The Trail Boss comes with a 2″ factory lift, factory skid plates, and Rancho monotube shocks. If you want improved stance without the Trail Boss premium, a leveling kit on a standard T1XX is the cheaper route.
• 1.5–2″ Leveling (standard T1XX): ReadyLift 66-3085 and Rough Country 1330 are T1XX-specific. Allows 275/65R20 on factory 20″ wheels. Confirm T1XX application when ordering — K2XX kits do NOT fit.
• 3.5″ Lift (T1XX-specific systems): Rough Country, BDS, and ReadyLift all make T1XX-specific 3.5″ systems that account for the IRS rear. UCAs required. Allows 285/65R20 or 275/70R20 depending on offset.
• 4–6″ Lift (BDS, Rough Country): BDS makes the reference T1XX 4″ and 6″ systems with factory-matched A-arms and their proprietary Coilover Conversion system that replaces the factory strut entirely. Allows 33–35″ tires at 4″ and 35–37″ at 6″. ZR2 trucks already have a 2″ factory lift and DSSV shocks — aftermarket lift on a ZR2 requires specific fitment — confirm ZR2 compatibility before ordering any T1XX lift kit.

For complete T1XX platform info see our T1XX Complete Guide.

Tire Sizing Guide After Lifting

• Stock / no lift: Factory 265/65R18 or 275/55R20 depending on trim. Up to 265/70R17 possible on some models with fender well trimming.
• 1.5–2″ level: 275/65R18 or 285/65R18 (18″ wheels), 285/55R20 (20″ wheels). No rubbing on most applications with correct wheel offset.
• 3″ level with UCAs: 285/70R17 (33″ equivalent), 285/65R18. May require minor trimming of the front mud flap/valance at full steering lock.
• 4″ lift with UCAs: 295/70R18 or 305/65R18 (34–35″ equivalent). Wheel offset matters — 0mm to +12mm outward prevents inner fender rubbing at full droop.
• 6″ lift: 35–37″ tires. At this height, fender flares are typically required for legal coverage in most states.

Best Lift Kit Brands — Ranked by Value

• BDS Suspension: Best overall quality. Engineered kits with matching shocks, UCAs, and hardware. More expensive ($1,200–$2,500 for 4–6″ systems) but the most complete out-of-the-box solution.
• ReadyLift: Best value leveling and 3″ lift kits. Widely stocked, well-documented fitment, solid quality at mid-range price ($150–$600).
• Rough Country: Best budget option. Lower quality components than BDS or ReadyLift but widely available and functional for mild builds. Shocks are the weak point — most owners upgrade to Bilstein 5100s alongside a Rough Country spacer kit.
• Cognito Motorsports: Best UCAs. Their forged aluminum UCAs with heavy-duty ball joints are the reference standard for 3–6″ lifted GM trucks. Pair Cognito UCAs with any brand’s spacer system for the best result.
• Fabtech: Strong performer for K2XX and T1XX 4–6″ systems. Less common than BDS but respected quality — good choice if BDS is backordered or out of budget.

Related Guides

• GMT900 Complete Owner’s Guide
• K2XX Silverado Complete Guide
• T1XX Silverado Complete Guide
• StabiliTrak Service Light Fix — lift installs can trigger StabiliTrak codes
• Best Exhaust for 5.3 Silverado

For GMT800-specific lift information: Best lift kit for GMT800 Silverado.

Keep going: find every GMT900 guide, known problem and fix in the GMT900 Hub and the K2XX Hub.