The RMS Street-Lynx rear suspension solves all of this and adds some cool extras, like being able to easily set your ride height for the most bitchin appearance. With the Street-Lynx, the coilovers and the four-links divide the job of the leaf spring into two tasks—the links locate the rear and correct the arc of the axle travel, they maintain pinion angle, and they offer adjustment for instant center. The coilovers, by contrast, support the full weight of the axle, while doing it at a fraction of the weight penalty of leaves. Here, RMS relies on a pair of U.S.-made billet aluminum Viking Warrior double-adjustable shocks, which have independent control of compression and rebound damping—all in a lightweight package that looks like jewelry. Relating to the overall weight issue, we obtained four-corner weights of our Valiant project car prior to any modifications. Once the project is complete, we'll weigh the car again to determine the overall balance and weight. We think our goal is reasonable: replace the Slant Six engine and stock driveline with an all-aluminum 657hp Indy-built Wedge, upgrade the 904 automatic with a built TCI 727, fortify our suspension with the RMS AlterKtion and Street-Lynx bits, and beef up the rear with a Strange S60. We expect we'll gain minimal weight, or even zero weight in the process, and the Street-Lynx will be a contributing factor.

Other cool Street Lynx fact: converting from leaves to a four-link provides an extra ¾ inch of tire clearance on the inside. With B- and E-Bodies, the lower bars are flush with the wheelhouse, allowing tire sizes as large as 28x12.5 without any other modification. There is even a pair of easy trailer tie-down holes in the axle mounting plates (which match the AlterKtion's front suspension tie-down loops in the front).

Here, we're following up last month's RMS AlterKtion front coilover suspension with the company's Street-Lynx four-link rear suspension. Work on our '68 Plymouth was once again performed by the knowledgeable Ron Aschtgen of Outlaw Motorsports in Riverside, California. Outlaw does nothing but muscle cars and race cars, and their skills run the range from engine building and chassis work, to sheetmetal, paint, and wiring. They are a complete one-stop shop with everything done in-house, so if you're considering having your work farmed out instead of doing it yourself, we recommend them highly. Outlaw got the Street-Lynx done in under four hours, not including stripping the old parts off, cleaning, and repainting the A-Body's chassis with Eastwood Extreme Chassis Black. The Street-Lynx job was significantly easier because there's no cutting involved and only a few easy welds need to be made.

Soon, Outlaw will help us tackle the installation of our front Wilwood brakes. We'll take a close look at those, and show you a cool piece from RMS that makes installing Wilwood's GM-based master cylinder into a Mopar a cinch!

To check out a video of the RMS Street-Lynx suspension installation at Outlaw Motorsports, go to the video page at and search for "Project Valiant: RMS Street-Lynx Rear Suspension Installation."

Strange Engineering
8300 North Austin Avenue
Morton Grove
IL  60053
Outlaw Motorsports
Reilly Motorsports
White Haven
PA  18661
Viking Performance
21401 Hemlock Ave
MN  55044