How to Install Ground Control Coilovers: A Careful DIY Guide

Step 1 Confirm the kit, suspension layout, and baseline measurements

Park on a level surface, set the parking brake, and place wheel chocks at the wheels that remain on the ground. Before lifting the car, compare the part numbers and labels with the application instructions. Separate front and rear components, and confirm which parts are left- and right-side specific.

Measure from the center of each wheel hub vertically to a repeatable point on the fender lip. Hub-to-fender measurements are more useful than measurements from the ground because tire pressure and tire size can affect ground clearance. Also measure the visible threads, spring perch position, and overall strut height where practical, then photograph the original assembly.

Record the direction of the original springs, the location of brake-line brackets, and the position of any camber plates. These records give you a reference if the kit instructions do not specify an initial setting. Do not assume the same number of exposed threads on both ends produces the same ride height; chassis tolerances and spring seating can differ.

Step 2 Raise the vehicle and remove the wheels

Loosen the wheel lug nuts slightly while the tires are still on the ground. Lift the vehicle according to the service manual, place jack stands securely, and gently test each supported corner before removing the wheels. Keep the removed wheels nearby so you can use them later as a clearance reference, but do not place them under the car as a substitute for jack stands.

With the wheels removed, inspect the suspension before touching the struts. Look for leaking dampers, torn ball-joint boots, cracked sway-bar links, damaged control-arm bushings, bent brake shields, and rusty mounting points. Installing adjustable suspension on worn or damaged components can create noises and handling problems that are not caused by the coilovers.

Support any suspension arm that may drop when the strut or shock is disconnected. On many cars, the sway-bar link is attached to the strut, so the suspension can move unexpectedly when that link is removed. Keep brake hoses and wheel-speed sensor wires supported; never let the caliper hang by its hose.

Step 3 Disconnect the strut and related brackets

Remove or loosen the brake-line bracket, wheel-speed sensor bracket, and sway-bar link hardware attached to the strut. Mark the original camber-bolt position if the vehicle uses an eccentric bolt, but understand that the mark is only a reference and cannot replace an alignment.

Support the steering knuckle or hub with a jack before removing the lower strut bolts. Remove the lower hardware, then loosen the upper mounting nuts from the engine bay or trunk area while keeping one nut engaged by a few threads. This prevents the assembly from dropping suddenly.

Check that the steering knuckle is not pulling on the brake hose, axle, or sensor wire. Remove the final upper fastener and guide the strut out of the wheel well. Set left and right assemblies separately if their brackets or mounts differ.

Some cars use a pinch bolt rather than two lower bolts, and some rear suspensions use a separate shock and spring instead of a complete strut. Follow the vehicle-specific removal sequence rather than forcing a part that appears stuck. A spreading tool or penetrating oil may help with a seized knuckle, but avoid damaging the aluminum housing or prying against a thin casting.

Step 4 Disassemble the factory strut only when the kit requires it

Place the removed assembly on a stable work surface and compare it with the Ground Control parts. If the kit is a complete replacement coilover, you may not need to disassemble the original spring and upper mount. If it is a sleeve kit, you may need to remove the factory spring, bump stop, dust boot, and upper mount before installing the new components.

Relieve spring force before removing the factory top nut. A compressed spring stores enough energy to cause severe injury if a compressor slips or the wrong part is loosened. Use the procedure and tool type specified by the service manual; if the spring compressor cannot grip the coils securely or the strut is heavily corroded, stop rather than improvising.

Inspect reusable parts while they are accessible. Replace a damaged upper bearing, cracked rubber mount, bent isolator, leaking damper, or deteriorated bump stop before assembly. A new adjustable spring cannot correct a worn mount, and reusing a failed damper may make the new setup unsafe or unpleasant to drive.

A useful way to approach how to install ground control coilovers is to check your progress after each stage.

Step 5 Assemble the Ground Control hardware in the specified order

Clean the strut body and remove rust, dirt, and burrs from the area where the adjustable sleeve will sit. Do not grind away structural material or modify the strut body unless the kit instructions explicitly require a qualified modification. Slide the sleeve or threaded housing into position, then install the lower locking hardware or retaining arrangement supplied with the kit.

Install the spring perch, thrust rings, spring, upper seat, bump stop, dust boot, and upper mount in the order shown by the instructions. A spring that appears symmetrical may still have a narrow end or a specified seating direction. Make sure the lower and upper ends are fully seated against their pockets before applying preload.

Thread the adjustable perch by hand first. It should turn smoothly without cross-threading, and the lock ring should engage enough clean thread to hold the setting. Do not use an impact gun on the adjustment threads or lock rings unless the manufacturer specifically permits it.

If the kit uses camber plates, note the marked left and right orientation and the permitted adjustment range. Route the damper adjustment knob, if supplied, so it remains accessible without contacting the hood, trunk trim, tire, or suspension during movement.

Step 6 Set a conservative initial height and spring preload

Use the manufacturer’s initial spring-preload and minimum-height instructions, not a guessed measurement. Spring preload is the amount of compression applied when the suspension is at full droop; ride height is the vehicle’s installed height on the ground. On many adjustable systems, height should be changed with the designated lower mount or sleeve rather than by arbitrarily tightening the spring perch.

Start near the supplied or recommended baseline. Ensure the spring remains captured when the suspension is fully extended. If the spring becomes loose, the perch is too low, the damper is too short for the setup, or the assembly is being used outside its intended range.

Do not “fix” a loose spring by adding random spacers or excessive preload.

Make the left and right sides visually and dimensionally similar, but do not force identical thread counts if the kit or chassis requires a small correction for driver weight or corner balance. Write down the initial sleeve, perch, and ride-height measurements so later changes are traceable.

Step 7 Reinstall each assembly and tighten the mounting hardware

Guide the coilover into the wheel well and loosely install the upper nuts or mount hardware. Align the lower mounting holes with the steering knuckle, then install the lower bolts and nuts in the original orientation. Reattach the sway-bar link, brake-line bracket, and wheel-speed sensor bracket without twisting or stretching their wires and hoses.

Snug the fasteners enough to hold the assembly while keeping the suspension aligned. Final torque should follow the vehicle service manual or kit instructions, and the suspension may need to be at normal ride height for some bushing-mounted bolts. Tightening rubber-bushed pivot bolts with the suspension hanging can preload the bushings and shorten their life.

Check that the spring, sleeve, lock rings, and upper mount are centered and that no part touches the body. Turn the steering from lock to lock by hand while watching the brake hose, tire, spring, and damper. On the rear suspension, confirm that the spring and shock move freely through the available travel.

Step 8 Install the wheels, settle the suspension, and set the starting ride height

Install the wheels and hand-tighten the lug nuts. Lower the vehicle carefully until the tires touch the ground, tighten the lug nuts in a star pattern to the vehicle’s specified torque, and then remove the remaining stands. Roll the car forward and backward several feet, or drive it slowly on private level ground, so the suspension settles naturally.

Do not judge the final height immediately after lowering the car. Bounce each corner gently, then repeat the hub-to-fender measurements from the baseline. If one side is substantially different, inspect spring seating, perch measurements, and installation orientation before adjusting anything.

Make height changes in small, equal increments on an axle unless the kit instructions say otherwise. Raise the car again, support it safely, clean and lubricate adjustment threads only with a product approved by the manufacturer, loosen the lock ring, make the adjustment, retighten the lock ring, and repeat the settling process.

Step 9 Perform the complete clearance and fastener inspection

With the vehicle on the ground, turn the steering fully left and right and inspect the inner tire sidewall, spring, sleeve, damper body, brake hose, and sensor wiring. Then raise each corner carefully to simulate suspension droop and look for a loose spring or stretched line. If possible, inspect clearance with the wheels straight and at both steering extremes.

Verify that the tires do not contact the fenders, inner liners, sway bars, or strut bodies. Check that the brake lines are clipped in their original locations and that the ABS wires have enough slack for steering and suspension travel. Look for an uneven spring seat, a lock ring that has backed off, or a mount installed backward.

Understanding how to install ground control coilovers also means recognizing the limits of the method.

Recheck every disturbed fastener with a torque wrench. Marking a torqued nut with a paint pen can make later visual inspections easier, but the mark is not a substitute for the specified torque. Confirm that the wheel lug torque is correct before moving the car.

Step 10 Drive cautiously to the alignment shop and document the final setup

The first drive should be short and slow on a smooth, low-traffic route. Listen for clunks, scraping, spring bind, or repeated tapping, and pay attention to pulling, steering-wheel misalignment, vibration, or unusual braking behavior. Stop immediately if a tire rubs, a line is stretched, or the car feels unstable.

After the suspension settles, have a four-wheel alignment performed. Changing ride height changes camber and toe, and excessive toe can damage tires quickly or make the car unpredictable. Ask for a printed alignment report and keep it with your installation notes.

After the first short drive and again after additional normal use, inspect the lock rings, mounts, brake-line routing, and tire edges. If the height changes, repeat the alignment check. This is how you complete the installation rather than merely bolting the parts onto the car.

Spring preload is not the same as ride height

Preload compresses the spring when the suspension is unloaded. Ride height is the position of the chassis with the car’s weight on the tires. On a true height-adjustable design, the lower mount or threaded body changes the installed height while preserving the intended spring preload.

Some sleeve systems do not offer independent height adjustment in the same way. Their instructions may use the threaded perch to establish both spring tension and ride height. Follow that design’s limits precisely, because excessive adjustment can reduce bump travel, create a loose spring, or place the damper outside its usable range.

Damper adjustment controls response, not vehicle height

If your dampers have rebound or compression adjustment, those settings change how quickly the suspension responds to movement. They do not safely replace the height-adjustment procedure. Begin at the manufacturer’s baseline and change only one setting at a time after the hardware and alignment are correct.

Ride height affects alignment and available travel

Lowering a vehicle generally changes camber and toe, although the exact direction depends on the suspension geometry. It can also reduce bump travel, increase the chance of bump-stop contact, and alter the angle of sway-bar links and control arms. A lower measurement is not automatically a better setup.