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Convert a classic Mopar E-body from leaf springs to an adjustable triangulated four link.
QA1 part R155-175 is built for 1970-1974 Dodge Challenger and Plymouth Barracuda applications with compatible axle housings.
Key Features
- Triangulated four link conversion for Mopar E-body vehicles
- Single adjustable coil over shocks
- 175 lb/in springs
- Adjustable anti-squat at the lower trailing arm brackets
- Compatible with factory or inboard relocated leaf spring mounts
- Powder coated tubular construction made in the USA
Fitment
| Years | Make | Model | Axle Housing | Position |
|---|---|---|---|---|
| 1970-1974 | Dodge | Challenger | Chrysler 8-3/4 in or Ford 9 in | Rear |
| 1970-1974 | Plymouth | Barracuda | Chrysler 8-3/4 in or Ford 9 in | Rear |
Specifications
| Detail | Value |
|---|---|
| Manufacturer Part Number | R155-175 |
| Position | Rear |
| Suspension Type | Triangulated four link |
| Adjustment | Single adjustable |
| Spring Rate | 175 lb/in |
| Axle Housings | Chrysler 8-3/4 in and Ford 9 in |
| Installation | Cutting and welding required |
| Sway Bar | Optional and not included |
What's Included
- R155-175: Tubular crossmember
- Upper trailing arms
- Lower trailing arms
- Lower brackets with adjustable anti-squat
- Single adjustable shocks
- 175 lb/in springs
- Installation hardware
About QA1
QA1 develops adjustable suspension systems for classic muscle cars and performance vehicles.
FAQ
What is the R155-175?
It is the exact manufacturer part number for this rear four link suspension system.
Is this a bolt in kit?
No. Cutting and welding are required.
Which axle housings fit?
It fits Chrysler 8-3/4 inch and Ford 9 inch axle housings.
Does it fit a Dana 60?
No. Dana 60 applications use a different QA1 part number.
What spring rate is included?
The supplied springs are rated at 175 lb/in.
Are the shocks adjustable?
Yes. The included shocks are single adjustable.
Is a sway bar included?
No. The compatible sway bar is optional.
Can factory leaf spring mounts remain?
The system works with factory or inboard relocated leaf spring mounts.
Installation Instructions
- Before installing R155-175, remove the leaf spring suspension and prepare the frame rails and axle housing according to QA1 instructions.
- Weld the upper crossmember to the frame rails and weld the four link tabs to the axle housing using a 220 volt welder with proper penetration.
- Install the arms, shocks, and springs, then verify clearances and complete a professional alignment and fastener inspection.
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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