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Street and Strip Control for Mustang II
The QA1 MS302-08500 Pro Front Coil-Over System delivers ride height adjustment and single-adjustable damping for Ford Mustang II front suspensions. The system uses 500 lb/in springs and twin-tube shocks to support street performance, drag racing, autocross, road racing, and street rod applications.
Key Features
- Single-adjustable damping with one knob that adjusts compression and rebound together
- QA1 MS302-08500 system with 500 lb/in spring rate
- Fully threaded shock bodies for ride height adjustment and weight balance tuning
- 18 damping settings with six clicks per revolution and three complete revolutions
- Front coil-over conversion design for Ford Mustang II applications
- Sold as a pair for an easy bolt-in installation
- Rebuildable and revalveable by QA1 or authorized service centers
- 100 percent dyno tested and serialized
Fitment
| Vehicle | Years | Position | Application | Restrictions |
|---|---|---|---|---|
| Ford Mustang II | 1974-1978 | Front suspension | Vehicle-specific front coil-over conversion system | Front application only. Sold as a pair. |
Specifications
| Detail | Value |
|---|---|
| Manufacturer | QA1 |
| Model | MS302-08500 |
| Product type | Front coil-over conversion system |
| Shock adjustability | Single adjustable |
| Shock type | Twin tube |
| Spring rate | 500 lb/in |
| Quantity | Pair |
| Damping adjustment | One knob adjusts compression and rebound together |
| Damping range | 18 settings per knob |
| Adjustment layout | Six clicks per revolution and three complete revolutions |
| Ride height | Adjustable through the fully threaded shock body |
| Recommended starting settings | 0-6 clicks for drag racing, 2-8 clicks for a comfortable ride and handling, 8-12 clicks for firmer ride and improved handling, 13 or more clicks for more aggressive handling |
| Lower shock hardware | Supplied 7/16 inch or 1/2 inch lower shock bolts for Mustang II installation |
| Adjustment direction | Fully counter-clockwise is the softest setting |
What's Included
- One QA1 MS302-08500 front coil-over conversion system
- Two QA1 high performance shocks
- Two chrome plated coil springs
- Mounting hardware
About QA1
QA1 develops performance suspension components for street, strip, autocross, road racing, and street rod use. QA1 adjustable Pro Coil systems are made in the United States, dyno tested and serialized, and designed to be rebuildable and revalveable by the QA1 factory or authorized service centers.
FAQ
What is the MS302-08500?It is a vehicle-specific front coil-over conversion system for Ford Mustang II applications. The system is sold as a pair with single-adjustable shocks and 500 lb/in springs.
What vehicles does this system fit?This system fits 1974-1978 Ford Mustang II applications for the front suspension.
What does single-adjustable mean?One adjustment knob changes compression and rebound damping at the same time.
How many damping settings are available?There are 18 settings per knob, with six clicks per revolution and three complete revolutions.
Which setting is the softest?Fully counter-clockwise is the softest setting. Do not exceed 18 clicks.
Can the ride height be adjusted?Yes. The fully threaded shock body and spring-seat adjuster allow ride height adjustment after installation.
What spring rate does the system use?The included springs use a 500 lb/in spring rate.
Is the system sold individually?No. The system is sold as a pair for the front suspension.
Is a thrust bearing kit recommended?QA1 recommends thrust bearing kit P/N 7888-109 for easier spring-seat adjustment.
Installation Instructions
- Confirm MS302-08500 matches the Mustang II front suspension and 500 lb/in spring requirement.
- Measure and record the vehicle ride height from the ground to the center of each wheel well.
- Unbolt the front upper shock mounts from inside the engine bay.
- Raise and support the vehicle by the frame with jack stands on a stable surface.
- Remove the front wheels.
- Remove the sway-bar end links.
- Unbolt and remove the lower shock mounts and the original shocks.
- Remove the lower ball joint cotter pin.
- Loosen the lower ball joint castle nut without removing it.
- Separate the lower ball joint from the spindle with a ball-joint separator.
- Use a coil-spring compressor to remove tension from the lower control arm.
- Remove the lower ball joint nut and the spring.
- Thread the aluminum lock nut and spring-seat adjuster nut down to the last thread with the shoulder facing upward.
- Lubricate the shock threads with Permatex Anti-Seize lubricant.
- Install the optional thrust bearing kit, or lubricate and install the spring-seat washer when the kit is not used.
- Fully extend the piston rod.
- Install the washer and bushing, slide the spring onto the shock, and insert the assembly into the upper spring pocket.
- Install the upper bushing, washer, and nut. Do not fully tighten the nut at this stage.
- Align the spring pigtail with the upper spring-pocket recess when applicable.
- Face the adjustment knob toward the spindle.
- Install the supplied 7/16 inch or 1/2 inch lower shock bolts for the Mustang II application.
- Reconnect and tighten the lower ball joint to the vehicle manufacturer's specification, then install a new cotter pin.
- Set the spring seat approximately 1.5-2 inches above the bottom-most thread as an initial factory ride height setting.
- Reinstall the sway-bar end links and front wheels.
- Lower the vehicle and bounce the suspension to seat the springs.
- Recheck ride height and raise the vehicle before making adjustments.
- Adjust ride height with a QA1 spanner wrench as needed, then tighten the lock nut against the spring-seat adjuster.
- Have a professional wheel alignment performed after the suspension changes.
- Use a floor jack, jack stands, ball-joint separator, QA1 spanner wrench T114W or T115W, SAE wrench and socket sets, coil-spring compressor, and Permatex Anti-Seize lubricant as needed.
- Do not use the shock as a droop limiter, and do not force the adjustment knob or use pliers or other tools on the piston rod or adjustment knob.
QA1
QA1 suspension parts are stocked at Black Ops Auto Works for American muscle cars and classic trucks. Shop coilover kits, shock absorbers, springs, handling kits, four link systems, sway bars, strut kits, rod ends, and suspension hardware for the Mustang, Camaro, Corvette, Challenger, Charger, and GM B-Body, F-Body, and G-Body platforms. Every product is filterable by year, make, model, trim, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 536 QA1 SKUs across coilovers, shocks, springs, and handling kit categories. What This Brand Covers QA1 is a suspension manufacturer known for adjustable coilover systems, shock absorbers, and complete handling kits built for muscle cars, classic trucks, drag cars, and pro touring builds. The lineup covers everything from single component shock replacement to full vehicle handling packages. Brand Focus QA1 concentrates on American muscle car and classic truck platforms, with deep coverage of GM, Ford, and ...
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