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Polyurethane Rear Control Arm Bushing by PolyPro

Polyurethane Rear Control Arm Bushing

A rear control arm bushing is the compliant joint that holds the trailing, lateral and camber arms of the rear suspension to the body or rear subframe. It decides whether the rear axle stays square under load and how much the rear end steers itself in a corner. PolyPro molds these bushings from polyurethane for passenger cars, crossovers, vans and towed equipment. All available sizes are listed in the catalog.

 

What rear control arm bushings do

A multi-link rear axle carries three to five arms per wheel, and every arm rests on joints at both ends. The trailing arm takes drive and braking loads, the lateral arms set rear camber and toe, and the camber link allows the wheel angle to be adjusted. The elastic insert inside each joint works in torsion, compression and shear at the same time. The more arms a layout uses, the more places free play can appear.

The rear axle is not steered, so its angles are held only by the stiffness of these joints. As the inserts soften, side loads move the arms and the wheel changes its own toe — that is rear steer in practice. On the front arms the driver feels this through the steering; at the rear it shows only as a change of line.

 

Signs of worn rear trailing arm bushings

Rear joints rarely knock as clearly as front ones, so they are often overlooked. The first symptom is a restless rear end: the car seems to lag during a lane change, it rocks on undulations, and with cargo in the trunk or a trailer behind it visibly wanders in its lane. Most drivers blame the tires or the dampers instead.

  • rear end wandering on lane changes
  • rocking on swells and joints
  • sawtooth wear on the rear tires
  • rear toe not holding its setting
  • knock from the rear under braking
  • a tear around the insert

Inspect the rear suspension on a lift with the arms unloaded: pry each arm fore-and-aft and sideways, looking for movement of the inner sleeve against the shell. Check the trailing arms separately, since they take the highest loads and fail first. An alignment rack shows whether the rear axle returns to its set angles after loading or already drifts within the free play of its joints.

 

Polyurethane or rubber in rear arms

The rear joint is asked for something different than the front one: not sharp response, but a stable axle under changing load. Rubber at the rear gives comfort, yet it sags under cargo weight and eventually lets the axle drift. On older cars the rear inserts are often the first to break down, because they work under constantly reversing loads.

Polyurethane sags less under weight and builds almost no permanent set, so rear toe keeps its setting longer and the car tracks straighter when loaded or towing. That removes part of the sawtooth wear on the rear tires. In exchange the rear axle becomes slightly louder over expansion joints. Choose hardness by how heavily the car is loaded; the Shore value is stated on each product page.

 

How to choose rear control arm bushings

Start by identifying the rear suspension type and the exact arm, then measure the old part. One axle often carries three or four different sizes, so ordering a blind rear kit rarely ends well.

By Suspension Type

A twist beam, a multi-link layout and a trailing arm axle each use a different set of joints. On a twist beam the main load sits on the beam mounts, which call for a rear beam bushing rather than an arm bushing. A multi-link wheel carries several different bushings: the trailing arm, two or three lateral arms and the camber link. Before ordering, raise the car and count the joints instead of relying on a generic model description. Check as well whether the arm uses a flanged shell and which face it bears against, since that decides whether the part fits without rework.

By Dimensions

The working figures are the same as at the front: outer diameter of the shell, inner diameter for the bolt and length of the joint. At the rear the risk is mixing positions up — neighboring arms often share an outer diameter but differ in length, and a short bushing will sit skewed in the bracket once the bolt is torqued. Measure each part separately with calipers and label straight away which arm it came off. If the arm has been repaired before, the bore may be worn or machined oversize, so measure it as it is rather than from a reference table. The same three figures appear on every catalog page.

By Durometer

At the rear, hardness follows load rather than driving style. A car that carries people and cargo, tows a trailer or regularly runs loaded behaves more predictably on firmer grades, because the rear axle changes its toe less under side forces. A passenger car without permanent load is well served by softer grades, and they add no boom over expansion joints. The Shore value is listed on every product page, so the intended duty can be matched to a specific item before ordering. Cars with a tow hitch usually take firmer grades on the trailing arms, because those joints carry the pulling load.

Why buy rear control arm bushings from PolyPro — retail and wholesale

We mold the parts ourselves: our own molds, our own casting shop, dimensional control at the end of the line and sales without middlemen. For rear suspensions that matters in practice, because the rear axle uses many rare sizes that the retail chain simply does not stock. Orders go by the piece: if one trailing arm joint has failed, there is no need to buy a kit for the whole axle. Non-standard parts are made from a drawing, a sample or a worn bushing, starting from one unit, and our products carry a warranty.

Repair shops, parts stores, fleets and resellers work on wholesale terms through the partner program: bonuses for turnover or for the size of a single order, access to prices and stock, and shipments under the partner's brand.

 

Frequently asked questions

How many bushings does a rear suspension have? 

It depends on the layout. A twist beam axle has one main mounting joint per side. A multi-link wheel runs three to five arms, and each arm carries one or two joints. Raise the car and count the mounting points before ordering, because sizes differ within a single axle and neighboring arms are easy to confuse.

Why is rear bushing wear less obvious than front wear? 

Because the rear axle sends no feedback to the steering wheel. Instead of a clear knock the driver gets a restless rear: lag on lane changes, rocking over swells and wandering with weight in the trunk. The symptom is usually blamed on tires or dampers, so rear bushings often run until the insert tears through.

Do rear bushings affect tire wear? 

Yes. As the inserts soften, the rear axle changes toe under load and the tire tracks at a slight angle to the road. That produces sawtooth wear across the tread blocks and uneven shoulder scrubbing. Replacing the joints and then setting rear axle geometry stops the process before the tires are ruined.

Is an alignment needed after replacing rear bushings? 

Yes, where the suspension design allows adjustment. New bushings return the arms to their designed position, so rear toe and camber should be checked on a rack. Torque the mounting bolts with the suspension loaded and the car standing on its wheels, otherwise the insert stays pre-twisted and wears from the first kilometers.

Can rear bushings be replaced with the arm on the car? 

Some of them, if there is access from below and the press tool fits. Trailing arms and joints with flanged shells are easier to press with the arm removed, because the force has to stay coaxial or the shell goes in skewed. The decision comes down to the state of the mounts and the corrosion on the bolts.

Should both sides of the axle be done together? 

Technically, yes. A new joint on one side works stiffer than a worn one on the other, and the rear axle then sits asymmetrically: under load one wheel changes toe more than the other. If the second side still measures well, at least pry-test it during the same job so it is not overlooked.

Can I order a single bushing instead of a set? 

Yes, retail here is by the piece. At the rear that is a common case: one trailing arm joint fails while the lateral arms are still sound. If the size you need is missing from the catalog, we will make it from a drawing, a sample or the worn part, also starting from a single unit.

What are the terms for shops, stores and fleets? 

They are served on wholesale terms. The partner program gives bonuses for turnover or for the volume of a single order, access to current prices and stock, and shipments under the partner's brand. For fleets we usually build a repeating parts list by vehicle model.