Suspension Reference Guide — Springs, Coilovers, Air, Lift & Leveling

Pictured products / vehicle applications

Find the right example for your vehicle.

Check the exact products shown in this guide by year, make, model and trim. Only relevant vehicle checks appear as you progress. For the full store selection, use Shop by Vehicle ↗.

Select your vehicle to see listed applications and exact product links.

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This selector covers the vehicle-specific examples pictured below. It is not the full store fitment database. Browse the full catalog by vehicle or request a parts review; a missing example does not mean no products fit your vehicle.

Shop the full catalog by vehicle ↗Request vehicle-specific parts ↗

Start with your goal

What should your suspension do?

Pick the goal that matters most. This helper suggests a build direction and a parts checklist; it does not verify a kit for your vehicle.

Start with a matched spring and damper plan.

A modest fixed drop can suit lowering springs. Check the exact spring application, damper compatibility, remaining travel, and alignment before selecting a set.

Browse lowering springs ↗ · Browse matched packages ↗

Choose by use, not just height

Four directions. Different commitments.

System	Height change	Good starting goal	Plan alongside it
Lowering springs	Usually a fixed, application-specific drop. Adjustable spring kits are a separate category.	A simpler street stance change.	Compatible dampers, mounts, travel and alignment.
Coilovers	Mechanical adjustment within the kit’s approved range.	Adjustable stance or a more tunable chassis.	Mounts, clearances, spring rates, damping and geometry.
Air suspension	Air pressure changes spring support; controls manage presets and height.	Adjust height between suitable driving and parked settings.	Vehicle-specific air hardware plus management, tank, compressor and plumbing.
Lift / leveling kits	Raises the vehicle or changes rake; method and range depend on the kit.	Truck stance, tire clearance or an engineered off-road setup.	Correct shocks, alignment, steering, travel and driveline requirements.

Budget for the complete installation.

Compare parts, installation, alignment, required corrections, and maintenance. A lower initial kit price does not establish the lower finished cost.

Understand the hardware

The spring supports. The damper controls.

Lowering springs

A spring supports the vehicle and sets the relationship between load and ride height. A lowering set changes that relationship for a specific application. The shock or strut controls how quickly the suspension moves.

Choose the exact engine, body and axle-load application. Inspect existing dampers and mounts; check whether the manufacturer allows the factory dampers or specifies replacements.

Shop spring sets ↗BILSTEIN: dampers for lowering springs ↗

Coilovers

A matched spring-and-damper system offers height adjustment; some also offer damping adjustment. Some rear suspensions still use a separate spring and shock within a “coilover kit.”

Height, preload, compression and rebound are different adjustments. Their relationship depends on the design. More adjustment clicks do not automatically mean better ride quality.

Shop coilovers ↗TEIN: full-length height adjustment ↗KW V2: rebound adjustment example ↗

Air Lift Performance 2020-2021 Toyota Supra (A90) Front Kit ↗**Part 78587**
Front axle air kit. Matching rear hardware, management and air supply are separate.
Choose your vehicle to check this exampleView this product ↗Application / component details ↗

Air suspension

An air spring uses compressed air to support the load. Management, valves, plumbing and air supply control it. Dampers still control motion.

A pair of front or rear air struts may be only one part of a system. Check what is included before assuming a “kit” contains management or every corner.

Shop air hardware ↗Understand the complete air system ↗

Choose comfort through the whole system.

Ride quality depends on spring rate, damping, travel, tires, vehicle load and setup. Lowering farther or adding stiffer parts can reduce useful travel; choose an approved driving height rather than a look alone.

Trucks / SUVs / Jeeps

Lift with a complete plan.

RL 2'' LEVELING KIT - 2019 GMC DENALI ↗**Part 66-3922**
2019 Sierra 1500 Denali with factory Adaptive Ride Control and six-lug wheels. Other years require application confirmation.
Choose your vehicle to check this exampleView this product ↗Application / component details ↗

Leveling kits

Leveling changes front-to-rear rake, often by raising the front. A spacer, adjustable strut or other kit can achieve it differently. Loaded stance may differ from unloaded stance.

Check trim-specific factory height, suspension type and the kit’s limits. A leveling kit is not automatically a long-travel upgrade.

Browse leveling kits ↗

Skyjacker 07-18 Jeep Wrangler JK 2 Door 2WD/4WD Long Travel 3.5in-4in Lift Kit w/Nitro Shocks ↗**Part JK35BPNLT**
3.5–4-inch long-travel lift kit for the two-door JK. Not a four-door Unlimited kit; not JL.
Choose your vehicle to check this exampleView this product ↗Application / component details ↗

Suspension lift kits

A suspension lift changes the chassis-to-wheel relationship. Kit design may involve springs, knuckles, crossmembers or other components. Taller shocks alone are not a complete lift.

Confirm 2WD/4WD, cab, engine, axle and factory lift or electronic suspension. Follow the exact bill of materials and exclusions.

Browse lift kits ↗

ICON 2022+ Toyota Tundra Front Foam Bump Stop Kit ↗**Part 56113**
Front foam bump-stop kit; manufacturer coverage: Tundra 2022–2026 and Sequoia 2023–2025.
Choose your vehicle to check this exampleView this product ↗Application / component details ↗

Travel & geometry corrections

Review shock compressed/extended lengths, bump stops, arm and ball-joint angles, brake/ABS line travel, sway-bar links, track-bar location and CV/driveshaft clearance.

The required parts vary by platform and lift height. Buy corrections specified by the kit manufacturer rather than adding every accessory automatically.

Read the lift planning guide ↗ReadyLIFT: control-arm compatibility ↗

Tire clearance is a separate check.

A lift height is not a guaranteed tire size. Wheel width, offset/backspacing, tire dimensions, turning clearance, full compression and kit-specific wheel requirements still matter. A body lift differs from a suspension lift and does not itself increase suspension travel.

Wheel & tire fitment guide ↗Lift springs ↗Leaf springs & accessories ↗Shocks & struts ↗

The parts around the kit

Build the system around your suspension.

SPC Performance 04-10 MazdaSpeed 3/00-10 Ford Focus Rear Adjustable Camber Arm ↗**Part 67420**
Match the listed trim and check the complete product instructions before ordering.
Choose your vehicle to check this exampleView this product ↗Application / component details ↗

Camber, caster & toe

Ride-height changes can move alignment away from the intended specification. Camber arms or plates address camber; toe links and other adjusters do different jobs. A camber kit does not replace an alignment.

Camber correction ↗ · Caster correction ↗SPC: alignment terms and application catalog ↗

BMR 78-87 G-Body Upper And Lower A-Arm Kit - Red ↗**Part AA030R**
Match the listed trim and check the complete product instructions before ordering.
Choose your vehicle to check this exampleView this product ↗Application / component details ↗

Control arms, bushings & joints

Inspect worn joints and bushings before chasing a handling upgrade. Adjustable arms can provide correction where the platform requires it. Spherical joints and firmer bushings may add noise, vibration and maintenance.

Control arms ↗ · Arm bushings ↗

Mounts, bearings & bump stops

Confirm whether top mounts are included or reused. Bump stops help manage the end of travel; do not remove or trim them unless the exact instructions require it. Check damper and spring clearance throughout travel.

Mounts & plates ↗ · Bump stops ↗

ICON 99-04 Ford F-250/F-350 Standard Sway Bar Link Kit ↗**Part 33600**
Front sway-bar links for 4–8 inches of front lift; not stock-height links.
Choose your vehicle to check this exampleView this product ↗Application / component details ↗

Sway bars & end links

Sway bars influence roll stiffness and handling balance. End links must fit the new geometry without binding or unwanted preload. A strut brace serves a different purpose and does not replace these parts.

Sway bars ↗ · End links ↗Eibach: handling and alignment accessories ↗

RL REAR HEAVY DUTY TRACKBAR JEEP JK07-18 ↗**Part 77-6003**
Rear adjustable track bar for JK 4WD at stock height through 4 inches of lift. Excludes JL.
Choose your vehicle to check this exampleView this product ↗Application / component details ↗

Lift-specific supporting parts

Depending on the kit, plan track bars, relocation brackets, brake-line solutions, differential or driveline corrections, leaf-spring hardware and appropriate fasteners. Check for required cutting, drilling or permanent modifications.

Track bars ↗ · Lift checklist ↗

Air Lift Viair 444C Compressor - 200 PSI ↗**Part 16444**
12V compressor: confirm duty cycle, tank size, power wiring, mounting and working pressure.
Choose your vehicle to check this exampleView this product ↗Application / component details ↗

Air supply & management

Plan the tank, compressor, manifold/controller, correct line and fitting sizes, electrical protection, moisture management and secure mounting. Height-based control adds sensors and linkage; match everything to the management instructions.

Compressors ↗ · Tanks ↗ · Air planning guide ↗

Buy correction parts after the application is understood.

The right combination depends on the vehicle, kit and measured alignment. Every car does not need camber arms, and every lift does not need every bracket.

Understand what changes

See the angles behind the stance.

Illustrative alignment technician and lowered coupe on an alignment rack — **Check the angles at the ride height you drive.** The diagrams below explain what an alignment measures. Generated educational scene; exact procedures and targets come from the vehicle and suspension manufacturer.

Educational camber diagram with labeled viewing direction — **Camber: front view**
Negative camber leans the tire tops inward. Positive camber leans them outward.
Enlarge diagram ↗

Educational caster diagram with labeled viewing direction — **Caster: side view**
Positive caster tilts the upper steering pivot toward the rear. It concerns the steering axis.
Enlarge diagram ↗

Educational toe diagram with labeled viewing direction — **Toe: top view**
Toe-in brings the front edges closer together; toe-out spreads them apart. It changes wheel direction.
Enlarge diagram ↗

Concept diagrams exaggerate angles for visibility. They do not give alignment specifications.

SPC: alignment-angle definitions ↗

Educational geometry diagram with labeled viewing direction — **Height changes geometry, not just appearance.**
Check arm and joint angles, steering clearance and suspension travel. The needed corrections depend on the platform and the exact kit; this schematic does not prescribe a lift limit.
Enlarge diagram ↗

Learn about alignment and correction parts ↗Watch the alignment explainer ↗

Watch the explanation

See why alignment matters.

Why Do Cars Need Wheel Alignment?

Hunter Engineering explains the purpose of alignment and the effects of misalignment. Use it with the angle diagrams and your vehicle-specific specifications.

Video by Hunter Engineering. Click to load the player; there is no autoplay.

Watch on YouTube ↗Manufacturer video page ↗

Use the resources together

Fitment starts with the exact vehicle.

Identify the application

Record year, make, model, chassis, engine, body, drivetrain and current suspension. Note adaptive damping, factory air, self-leveling, special packages and prior modifications.

Start with Shop by Vehicle ↗

Check the part number

Compare the manufacturer’s application and exclusions with the product page. Check axle, left/right, pair or single, front/rear coverage and all included components.

A year range or supplier tag alone does not approve fitment.

Request a part review ↗

Check the finished setup

Plan ride height, alignment, wheel/tire clearance, travel and installation. For adaptive or factory air systems, verify compatible retention or conversion hardware.

Use the wheel clearance guide ↗ · Request installation pricing ↗

Use wheel fitment data for wheel questions.

The Ultimate Fitment Guide helps with wheel and tire planning. It does not certify a spring, damper, lift kit or air-strut application. Manufacturer-specific part numbers and equipment requirements remain the suspension fitment check.

Speedzone suspension & chassis brands

Find the brand. Then check the application.

Explore 98 suspension and related chassis brand collections reviewed in the store. Categories help you browse brand families; individual products vary by vehicle and series. Stock and assortment can change.

Search brandsBrowse by area

98 brand collections in the directory.

Open the complete brand directory

ACCUAIR

Air & load support

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Suspension Reference Guide — Springs, Coilovers, Air, Lift & Leveling

Find the right example for your vehicle.

What should your suspension do?

Start with a matched spring and damper plan.

Four directions. Different commitments.

The spring supports. The damper controls.

Lowering springs

Coilovers

Air suspension

Lift with a complete plan.

Leveling kits

Suspension lift kits

Travel & geometry corrections

Build the system around your suspension.

Camber, caster & toe

Control arms, bushings & joints

Mounts, bearings & bump stops

Sway bars & end links

Lift-specific supporting parts

Air supply & management

See the angles behind the stance.

See why alignment matters.

Why Do Cars Need Wheel Alignment?

Fitment starts with the exact vehicle.

Identify the application

Check the part number

Check the finished setup

Find the brand. Then check the application.

ACCUAIR

Air Lift Performance

All Balls Racing

ARB (4x4 Accessories)

Arm Motorsports

AST Suspension

B&G Suspension

BC Racing

Belltech

Bilstein

BlackWorks Racing

Blox Racing

BMR

BuddyClub

Burly Brand

Cognito

Cusco

D2 Racing

Detroit Speed

Dinan

Eibach

Energy Suspension

Fabtech

Faction Fab

Firestone Ride-Rite

Five8 Coilovers

Ford Performance

Fox Suspension

Function and Form

Godspeed

H&R Suspension

Hellwig

HKS

Hotchkis

ICON Vehicle Dynamics

ISC Suspension

ISR Performance

JKS Manufacturing

King Off-Road Racing Shocks

Koni

Ksport Suspension

KW Suspension

KYB Suspension

MaxTrac Suspension

Mcgaughys

Megan Racing

Moog

MPC Motorsports

MSS Suspension

Neuspeed

NM Engineering