How to Install Rev9 Coilovers: A Safe Setup and Alignment Guide

Step 1 Confirm the kit and inspect every component

Before lifting the vehicle, compare the part numbers on the boxes and coilovers with the application listed for your car. Check the model year, body style, engine or drivetrain differences, front and rear configuration, and whether the kit is intended for a vehicle with electronic dampers or other factory suspension controls.

Lay out the coilovers, adjustment spanners, lock collars, mounting hardware, and any replacement brackets or bushings. Look for bent threaded bodies, damaged threads, leaking dampers, torn boots, missing washers, or hardware that does not match the instructions. Do not install a visibly damaged component or substitute a random fastener because it appears to fit.

Read the adjustment instructions before touching the collars. On most adjustable coilovers, the spring collars establish spring preload while the lower mount or shock body adjusts overall length and ride height. The correct method is application-specific, and forcing a locked collar against dirty threads can damage the coating or make later adjustment impossible.

Step 2 Measure the original ride height and prepare the work area

Park on a level, hard surface with the steering wheel straight. Measure from the center of each wheel hub vertically to the lower edge of the fender or another repeatable body reference, and write down all four measurements. Hub-to-fender measurements are more useful than measurements from the ground because tire pressure and tire size can distort ground-based readings.

Photograph the original front and rear suspension, brake-hose routing, sway-bar connections, and the position of upper mounts. These references help when several similar brackets are removed. Loosen the wheel lug nuts slightly while the tires are on the ground, but do not remove them yet.

Read the vehicle service information for lifting points and for any special procedure involving ride-height sensors, electronic dampers, air suspension, or brake lines. If the vehicle has an electronically controlled suspension system, the coilover kit may require a compatible cancellation module or a warning-light procedure; do not disconnect or bypass a system without following the kit and vehicle instructions.

Step 3 Lift the vehicle and remove the wheels

Chock the wheels that will remain on the ground, then lift the vehicle at the approved central lifting points. Place jack stands at the specified structural support points and lower the vehicle onto them gently. Shake the vehicle lightly at a solid body or suspension point to confirm that it is stable before removing the wheels.

Remove the wheels and place them out of the work area. Keep lug nuts and vehicle-specific hardware in labeled containers. Do not let a brake caliper hang by its hose; if it must be moved, support it with suitable wire or a strap attached to a strong suspension point.

With the wheels removed, compare both sides before disassembly. Uneven factory components, bent brackets, damaged bushings, or a leaking original damper can indicate a separate repair that should be addressed rather than hidden by the new coilovers.

Step 4 Disconnect the suspension items that prevent removal

Start at one corner and take photographs as you go. Depending on the vehicle, you may need to disconnect the sway-bar end link, brake-hose retaining bracket, ABS-wire clips, upper control-arm connection, or other link attached to the strut or shock assembly. Remove only the connections required by the instructions, and support heavy components so they do not pull on hoses or wiring.

Apply penetrating oil to rusty fasteners and clean exposed threads with a wire brush. Use a wrench on the matching nut or bolt head rather than relying on an impact tool to spin a fastener against a rubber bushing. If a ball-joint stud spins, use the vehicle-specific service method instead of applying uncontrolled heat near brake components, wiring, or fuel lines.

Leave the main assembly supported while loosening its upper and lower fasteners. On a front strut, remove the lower knuckle bolts only after the assembly is supported, then remove the upper mounting nuts while holding the strut. On a separate rear spring and damper layout, the spring and damper may come out by different routes.

Step 5 Remove the original strut or shock assembly

Support the hub or knuckle with a jack before separating it from the damper. This prevents the brake hose and axle from being stretched and keeps the suspension from dropping suddenly. Remove the original assembly according to the service manual, keeping track of bolt orientation, spacers, washers, and left-versus-right components.

Do not disassemble a factory strut with a compressed spring unless the Rev9 instructions explicitly require transferring a component and you have suitable spring-compressor equipment and the training to use it. A compressed coil spring stores substantial energy. If the job requires moving a factory spring or mount and the procedure is unclear, stop and have that portion completed by a qualified suspension shop.

Once removed, compare the original assembly with the replacement. Check approximate length, mounting-hole pattern, bracket position, and the location of brake-line or ABS-wire tabs. A difference that is shown in the instructions may be intentional; a difference that leaves a bracket unusable or changes the mounting orientation is a reason to stop and verify the application.

Step 6 Set the Rev9 coilovers to a sensible starting position

Before installation, set the coilovers to the manufacturer’s recommended starting adjustment. If the instructions provide a baseline ride height, spring-preload setting, or damper-click position, record it and use it. If they do not, avoid making a dramatic height change during installation; preserving a moderate amount of suspension travel is more important than achieving the lowest possible stance.

Use the supplied spanner wrenches to loosen and tighten the lock collars. Keep the threaded bodies clean, and never use a hammer and punch on the adjustment collars unless the manufacturer specifically approves that method. On a height-adjustable design, adjust the lower mount or shock body as directed rather than reducing spring preload until the spring is loose.

A properly installed spring should remain seated in its upper and lower perches through the expected range of suspension movement. A loose spring at full droop, insufficient thread engagement, or a coilover adjusted beyond its marked safe range indicates an incorrect setup, not a finishing detail.

Step 7 Install each coilover without loading the hardware incorrectly

Position the new coilover in the same general orientation as the original assembly, with its brackets and adjustment controls accessible as shown in the instructions. Start every fastener by hand so the threads are not crossed. Do not fully tighten suspension pivot hardware while the suspension hangs unless the service instructions specifically call for that position.

For a front strut, loosely secure the upper mount, align the lower mount with the knuckle, and reconnect the brake-line and ABS-wire brackets. For a separate rear spring and damper, install the spring with its ends seated correctly in the perches and install the damper without twisting its bushings. Follow the supplied diagram for upper-mount orientation; reversing a camber plate or offset mount can create handling and clearance problems.

Reconnect sway-bar links and any sensor brackets. Make sure the brake hose has a natural curve with the steering turned in both directions, and confirm that the ABS wire is clipped away from the spring, tire, and moving joints. The assembly should fit without prying, hammering, or forcing a misaligned bolt through its hole.

Step 8 Set the initial ride height and secure the adjustment collars

Measure the new hub-to-fender height with the vehicle still supported if the instructions provide a useful baseline, but remember that the final measurement must be taken with the vehicle on the ground. Adjust both sides of an axle equally as a starting point. Keep enough clearance for the tire, wheel, brake line, and suspension movement rather than choosing height by appearance alone.

After the height is set, tighten the lock collars against the correct surfaces using the supplied spanners and the manufacturer’s method. Do not assume that a collar is secure because it feels tight by hand. Confirm that the spring perch and lower mount are not moving relative to the threaded body, and record the number of exposed threads or the measured height so the opposite side can be matched.

A useful way to approach how to install rev9 coilovers is to check your progress after each stage.

Do not use the ride-height adjustment to compensate for a sagging or incorrectly seated spring. If the two sides differ substantially after matching the settings, inspect the spring seats, mounts, bushings, and installation orientation before making further adjustments.

Step 9 Tighten the suspension hardware at the correct position

Snug the fasteners first, then use the vehicle service manual or Rev9 instructions for final torque values. Torque values are not interchangeable between vehicles, and the largest-looking bolt is not automatically the one that receives the highest torque. Replace one-time-use nuts or bolts when the service information requires it.

Rubber-bushed suspension pivots generally need to be tightened at normal ride height so the bushing is not twisted through its operating range. If the vehicle uses spherical bearings or a different mounting design, follow its specific instructions instead. Use a calibrated torque wrench for final tightening and mark completed fasteners with a paint marker if that helps prevent omissions.

Recheck every connection at the corner before moving on: upper mount, lower mount, sway-bar link, brake-hose bracket, ABS-wire clips, spring collars, and any sensor linkage. Repeat the installation on the other side, using the completed side as a reference but not as a substitute for reading the instructions.

Step 10 Reinstall the wheels and lower the vehicle carefully

Clean the wheel mounting surfaces and install the wheels by hand-starting the lug nuts. Lower the vehicle until the tires just touch the ground, then torque the lug nuts in the vehicle’s specified pattern and to its specified value. Lower it fully and remove the jack stands only after confirming that the vehicle is stable.

Roll the car forward and backward a short distance or bounce each corner gently to let the suspension settle. Do not use aggressive bouncing or stand beside a vehicle with a loose component. Measure hub-to-fender height again on level ground and compare left to right and front to rear.

A small difference can come from the surface, steering position, or the suspension settling. A persistent or large difference, a spring that is not seated, or a wheel that sits visibly out of position requires inspection before driving.

Step 11 Check steering, clearance, and damper adjustments before the first drive

Turn the steering fully from lock to lock while watching the tire, spring, damper body, brake hose, ABS wire, and inner fender. Check the same areas with the suspension loaded and, where safely possible, with the wheel hanging. Inspect the rear suspension for tire-to-spring or tire-to-body clearance as well.

Confirm that every damper adjuster can be reached and that its setting is the same side to side. Start at the recommended baseline rather than immediately choosing the stiffest setting. A damper setting changes how quickly the suspension moves; it does not replace correct spring preload, ride height, alignment, or safe clearance.

Before driving, compare the steering wheel position, brake-pedal feel, and visual wheel alignment with their original condition. The steering may be off-center because toe changed during the installation, which is why the car should go directly to an alignment appointment rather than being used for extended driving.

Step 12 Perform a cautious initial drive and arrange alignment

Drive only far enough to evaluate basic operation on a quiet road. Use gentle steering, braking, and acceleration, and listen for clunks, scraping, spring movement, or repeated knocking. Stop immediately if the vehicle pulls sharply, the steering binds, a wheel rubs, a brake hose stretches, or any fastener appears loose.

After this short check, return to a level surface and inspect all four corners again. Look for fresh contact marks, shifted collars, leaking damper fluid, loose wiring clips, or hardware that has backed out. Do not treat the absence of noise as proof that the installation is correct.

Have a qualified shop perform a four-wheel alignment as soon as practical. Coilover installation commonly changes toe and camber, and some vehicles need adjustable arms or camber plates to bring the angles into an appropriate range. Ask for a printout and keep it with your installation notes.

Spring preload is not the same as ride height

Spring preload is the amount a spring is compressed when the suspension is at full droop or before the vehicle’s weight is applied. Changing preload can alter how firmly the spring remains seated and may affect available travel, but it is not a universal ride-height control.

Many height-adjustable coilovers change ride height by changing the distance between the lower mount and the shock body. This allows the spring relationship to remain closer to the intended setting. If you lower the car by simply backing off the spring perch, you may create a loose spring or reduce bump travel.

Ride height affects alignment and suspension travel

Lowering a vehicle changes control-arm angles, toe, camber, roll-center position, and the amount of bump and droop travel available. A car that looks level in the driveway can still hit its bump stops, rub a tire during steering, or behave unpredictably over a dip.

Set the height conservatively at first. After alignment and normal driving, you can make small, equal adjustments and repeat the clearance, torque, and alignment checks. Each height change can alter alignment enough to justify another measurement.

Damper adjustment controls motion, not load capacity

If your Rev9 coilovers have adjustable dampers, the clicks or positions change damping force. They do not increase the vehicle’s payload rating, correct a worn bushing, or make an excessively low setting safe. A very stiff setting can reduce grip on rough roads because the tire may not follow the surface effectively.

Keep left and right settings equal unless a documented tuning reason calls for a difference. Record the baseline so you can return to it after testing. Make one change at a time and evaluate it on the same type of road.

Stop when a fastener or mount will not seat normally

A bolt that requires heavy prying, a mount that does not align, or a coilover that seems to fit only after bending a bracket is not a normal adjustment issue. Stop and verify the part number, installation orientation, and vehicle application. Continuing can place side loads on the suspension or damage threads.

Do not diagnose every noise as a damper setting

Damper clicks do not fix loose hardware or a spring that is moving in its perch. If a noise changes with steering angle, inspect brake hoses, sway-bar links, top mounts, and tire clearance. If it changes with braking, also inspect the brake assembly and wheel mounting surfaces.