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Build or service a suspension, steering, or fabrication assembly with this QA1 shocks and struts. Manufacturer part number DD402 uses the listed Proma Star Series Coil-Over Shock Absorber - Double Adj. - Bushing Mount - 10.125in/14in - Alum configuration, and compatibility is determined by exact dimensions, threads, mounts, travel, load, and mating components rather than vehicle name alone.
Key Features
- Ride Height Adjustment: Threaded spring seat and included hardware allow quick changes for exact stance without disassembly.
- Double Adjustable Valving: Independent compression and rebound knobs provide fine-tuned damping for track precision or street comfort.
- Aluminum Construction: Lightweight body ensures durability and performance in racing environments like circle track and drag.
- Mounting Options: Poly bushings with 1/2-inch and 5/8-inch sleeves reduce noise, vibration and harshness while fitting common applications.
- Designed for custom chassis, suspension builds or vehicles lacking direct-fit shocks, including street rods, drag cars and circle track setups.
- Requires 2.5-inch inside diameter coil springs. select rate and length based on vehicle weight and ride height goals.
Fitment
| Fitment Basis | Universal or interface-specific |
|---|---|
| Required Verification | Confirm dimensions, thread size and direction, mounting style, travel, spring rate, load, clearance, and mating components |
| YMM Status | No vehicle model is assigned when compatibility is determined by physical interface |
Specifications
| Brand | QA1 |
|---|---|
| Manufacturer Part Number | DD402 |
| Product Type | Shocks and Struts |
| Listed Configuration | Proma Star Series Coil-Over Shock Absorber - Double Adj. - Bushing Mount - 10.125in/14in - Alum |
| Compatibility Basis | Universal |
| Condition | New |
What's Included
One new QA1 shocks and struts identified by manufacturer part number DD402, with only the components and hardware supplied by QA1 for that exact part number.
About QA1
QA1 develops suspension, steering, driveline, rod-end, bearing, spring, and chassis components for street, performance, racing, restoration, and custom vehicle applications.
Related QA1 Products
- Shop all QA1 products
- QA1 Proma Star Series Coil-Over Shock Absorber - Double Adj. - Bearing Mount - 10.125in/14in - Alum
- QA1 Proma Star Series Coil-Over Shock Absorber - Single Adj. - Bushing Mount - 10.125in/14in - Alum
- QA1 Proma Star Series Coil-Over Shock Absorber - Single Adj. - Bearing Mount - 10.125in/14in - Alum
Frequently Asked Questions
How do I confirm QA1 DD402 is compatible with my build?
Compare every listed dimension, thread size and direction, mount, travel range, spring rate or load requirement, clearance, and mating component with the planned assembly.
What measurements matter when ordering QA1 DD402?
Verify the dimensions and interfaces named in this listing, including thread size and direction, extended and compressed length, bore, spring dimensions or rate, mounting style, and available clearance as applicable.
Does QA1 DD402 require setup after installation?
Suspension and steering work commonly requires torque verification, clearance and travel checks, ride-height or damping setup when adjustable, and a professional alignment before road use.
Installation
Follow the current QA1 instructions for this exact part number. Support the vehicle safely, compare every component before disassembly, use the specified hardware and torque values, verify thread engagement and mounting orientation, cycle the suspension through its operating range, check brake and wheel clearance, and complete an alignment when the installation changes suspension or steering geometry.
QA1
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