QA1 R155-175 Rear 4-Link Coilover System for 1970-1974 Dodge Challenger/Plymouth

Vehicle Fitment

• 1970-1974 Dodge Challenger (E-Body, Base, Rear, Chrysler 8-3/4in. or Ford 9in. axle housing)
• 1970-1971 Dodge Challenger (E-Body, R/T, Rear, Chrysler 8-3/4in. or Ford 9in. axle housing)
• 1970 Dodge Challenger (E-Body, T/A, Rear, Chrysler 8-3/4in. or Ford 9in. axle housing)
• 1972 Dodge Challenger (E-Body, Rallye, Rear, Chrysler 8-3/4in. or Ford 9in. axle housing)
• 1970-1974 Plymouth Barracuda (E-Body, Base, Rear, Chrysler 8-3/4in. or Ford 9in. axle housing)
• 1970-1971 Plymouth Barracuda (E-Body, Gran Coupe, Rear, Chrysler 8-3/4in. or Ford 9in. axle housing)

Fitment Notes

• Designed for Mopar E-Body rear suspension conversion applications.
• Compatible with Chrysler 8-3/4in. and Ford 9in. rear axle housings.
• Does not fit Dana 60 axle housings; the QA1 R165-175 is the corresponding Dana 60 version.
• Converts the factory leaf-spring rear suspension to a triangulated four-link coilover configuration.
• Installation requires cutting and welding to the frame and axle housing.
• Works with factory-located or inboard-relocated leaf-spring mounts.
• Rear sway bar is optional and is not included.

Features

• Triangulated four-link rear suspension conversion.
• Single-adjustable coilover shocks for damping control.
• 175 lb/in. coilover springs included.
• Adjustable lower trailing-arm brackets provide anti-squat tuning.
• Powder-coated tubular crossmember and trailing-arm construction.
• Adjustable ride height through the coilover shock assemblies.
• Helps provide additional wheel and tire clearance.
• Designed to improve rear suspension stability and handling.
• Suitable for street, autocross, road-course and drag-racing applications.
• Compatible with OE brakes or aftermarket rear disc-brake conversions.

Specifications

• Brand: QA1
• Part Number: R155-175
• Product Type: Rear Four-Link Coilover Suspension System
• Position: Rear
• Vehicle Platform: Mopar E-Body
• Model Years: 1970-1974
• Suspension Design: Triangulated Four-Link
• Shock Valving: Single Adjustable
• Spring Rate: 175 lb/in.
• Axle Housing: Chrysler 8-3/4in. or Ford 9in.
• Installation: Cutting and welding required
• Leaf-Spring Mount Compatibility: Factory or inboard-relocated
• Rear Sway Bar: Optional, not included

Included Components

• 1x Tubular Rear Crossmember
• 2x Upper Trailing Arms
• 2x Lower Trailing Arms
• 1x Lower Trailing-Arm Bracket Set
• 2x Single-Adjustable Coilover Shocks
• 2x 175 lb/in. Coilover Springs
• 1x Installation Hardware Set

Product Description

The QA1 R155-175 is a rear four-link coilover suspension system designed for 1970-1974 Mopar E-Body vehicles, including the Dodge Challenger and Plymouth Barracuda. It converts the original leaf-spring rear suspension to a triangulated four-link layout with single-adjustable coilover shocks, providing greater control over suspension geometry, damping and ride height.

The system uses 175 lb/in. coilover springs and adjustable lower trailing-arm brackets for anti-squat tuning. It is engineered for Chrysler 8-3/4in. and Ford 9in. rear axle housings and can accommodate factory or inboard-relocated leaf-spring mounting locations. Installation requires cutting and welding to the frame and axle housing, so professional fabrication and proper suspension setup are recommended.