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QA1 R401-200 Rear Suspension Kit, Quad Adj., 67-79 Mopar A-Body, 200 Rate
QA1 R401-200 Rear Suspension Kit, Quad Adj., 67-79 Mopar A-Body, 200 Rate

QA1 R401-200 Rear Suspension Kit, Quad Adj., 67-79 Mopar A-Body, 200 Rate

63-76 Dodge Dart, 70-76 Plymouth Duster, 60-76 Plymouth Valiant, 64-69 Plymouth Barracuda

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QA1 R401-200 Rear Suspension Kit, Quad Adj., 67-79 Mopar A-Body, 200 Rate
QA1 R401-200 Rear Suspension Kit, Quad Adj., 67-79 Mopar A-Body, 200 Rate
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We estimate this item will ship on or before December 24th.
Part # 721R401200
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Important Messages:

  • This item ships directly from the manufacturer. It may take an additional 10 business days for QA1 to ship this item.
  • This item ships via Ground Shipping only. Expedited and Air shipping options are not available.


Rear Suspension Type:
Solid Axle
Trailing Arm Style:
Triangulated 4-Link
Suspension Kit Type:
Suspension Height Adjustment:
Stock Height
Spring Type:
Spring Rate:
200 lbs.
Shocks Included:
Shock Adjustability:
4-Way Adjustable
Axle Housing Included:
Material Type:
Sold in Quantity:


Available for 1967-1979 Mopar A-body vehicles with an 8-3/4" rear axle assembly, this revolutionary system replaces leaf springs with a 6-link suspension. The 6 links replicate the geometry of the tried-and-true 4-link while still mounting to the existing locations on the chassis.

This system provides an easy, bolt-in option to replace your leaf springs without having to do any cutting, welding or fabricating, Now you can get the performance that comes with coil-over shocks without taking a torch to your Mopar.

The Rear Suspension Conversion System positions the roll center near the original location, so it works well with stock or modified front geometry. Made of tubular steel, this system provides smooth, bind-free movement that eliminates the need for special links or compliant bushings like typical 3- and 4-links. It?s available with QA1 single, double, or 4-way adjustable shocks with soft, medium and firm spring rates to dial in the perfect ride. It works with the factory fuel tank, and is designed for 26 inch fender height with 27 inch tall tires with 1 inch of ride height adjustability in either direction.

This conversion system includes shocks, springs, frame brackets, axle brackets, linkage assemblies, center cross member assembly, sway bars, spanner wrench and all the necessary hardware.

Some parts are not legal for use in California or other states with similar laws/regulations

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Videos & Articles
  • Speedway Motors and Classic Trucks teamed up to build a 1952 Chevy Truck in celebration of Speedway Motors’ 65th Anniversary. Jason and Tom take a few minutes to talk about the rear suspension the team used on the truck.
  • Get up to date with the latest rule change and successfully update your sprint car support bars with the help of our very own Jason Martin!
  • Whether you are looking to change the look of your truck, get rid of your tired rusty springs, or upgrade the ride quality of your truck, Speedway Motors has you covered with stock height and lowered spring options.

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