Rear Suspension Upgrade Plan: Shocks, Springs, and Bushings

The engine situation is still the priority -- a confirmed compression failure in cylinder #1 isn't something that gets skipped over. But while the wagon sits and waits, I've been working through what the rear suspension is going to need once the car is actually running again. Better to know now than to figure it out later.

The goal here is smoother, at stock ride height. Not lower, not stiffer. The wagon sits tall from the factory and that's fine. This is about replacing 40-year-old components with parts that actually work the way they're supposed to.

What the rear suspension actually is

The 1985 Town & Country is built on Chrysler's K platform, the same front-wheel-drive architecture as the Dodge Aries and Plymouth Reliant. The rear uses a semi-independent beam axle setup -- a torsion beam connecting the two rear wheels, held to the body by rubber bushings on each side. The rear coil springs sit between that beam and the body, and the rear shocks are separate bolt-on units. The front suspension is fully independent MacPherson struts; the rear is not.

That matters for sourcing parts because there are three distinct things to address: the shocks that dampen movement, the springs that carry the weight, and the bushings that mount the beam to the body. Each is a separate part, and each has its own sourcing challenge.

The bigger complication is that the wagon runs a heavier rear spring rate than the K-car sedan. The wagon body is heavier, so the spring was wound to a different spec from the factory. That difference shows up in the parts catalog -- some springs that look like they should fit will explicitly exclude the station wagon. Worth verifying every time.

Shocks

The rear shocks on the wagon are conventional bolt-on units, separate from the springs. They're the easier piece to source -- the K platform was common enough that the aftermarket supply chain is healthy. The KYB Excel-G came up consistently in research as the mid-range pick for this application.

KYB Excel-G 343164

The KYB 343164 is confirmed to fit the 1983-1988 Chrysler Town and Country, along with the Dodge Aries, Plymouth Reliant, and a wide range of other K-platform cars. KYB builds the Excel-G on the same assembly lines as their OEM production, valved specifically for each vehicle application -- meaning the damping rate is calibrated to restore factory ride characteristics rather than being a generic tune. It comes with all necessary hardware for installation and carries a limited lifetime warranty. Two needed for the rear, around $66 each at AutoZone.

Springs

Springs are the more complicated piece. Finding rear coil springs specifically for the wagon, rather than the sedan, takes more care. The wagon spring is wound to a heavier spec to handle the additional body weight. Installing sedan springs would likely result in the car sitting lower than stock -- the opposite of the goal.

Moog 8621

The Moog 8621 rear coil spring set is confirmed to fit the 1985-1988 Chrysler Town and Country wagon specifically -- not just the sedan variants. That distinction matters given the heavier spring rate the wagon uses. Moog offers constant rate and variable rate versions. The constant rate restores original specifications; the variable rate is designed for heavier loads. Since the goal is smoother at stock height rather than added load capacity, the constant rate 8621 is the right call. It brings the rear suspension back to what the factory intended without adding stiffness.

Bushings

This is the one area I haven't been able to nail down. The cracked bushing in the earlier photos is on the rear beam -- the pivot point where the beam mounts to the body on each side. Finding a confirmed aftermarket part number for it has been harder than expected.

Part of the problem is naming. Parts catalogs for the K-platform list "Front Lower Control Arm Bushings," and at first that seemed like it might be what I was looking for. It's not -- those are for the front suspension, not the rear beam. The rear bushing appears to be either a part that isn't widely catalogued in the aftermarket anymore, or goes by a name I haven't found yet.

The best path forward on this one is TurboDodge forums. Someone in that community has done this repair on a K-car wagon and will know the correct part number, what it's called in the catalog, and whether a polyurethane upgrade option exists. That's the next step before anything gets ordered.

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Parts summary

What comes next

Nothing gets ordered until the engine work is done. The compression failure in cylinder #1 is the priority -- getting the car running again is the prerequisite for everything else. Once that's resolved, the suspension work is a logical next step. Replacing all three components at the same time makes sense since the car will be up in the air anyway.