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Polyurethane Rack and Pinion Bushing by PolyPro

Polyurethane Rack and Pinion Bushing

A rack and pinion bushing holds the steering rack housing on the subframe or body and centres the rack shaft inside that housing, so steering precision, feedback and the absence of knocking over bumps all depend on it. Once the seat is worn out, play appears and the driver feels it as a delayed response at small steering angles. PolyPro moulds these bushings from polyurethane in its own tooling for passenger cars, vans and light commercial vehicles. The rest of the range is in the catalogue.

 

What a Rack and Pinion Bushing Is and How It Works

Most designs use two groups of parts in this assembly. The first is the support bushing inside the rack housing: it keeps the rack shaft on its axis, sets the clearance and takes the side loads that build up when the wheels are turned. The second is the steering rack mount bushing, which clamps the housing to the subframe or body; it holds the rack in place and damps vibration travelling from the road into the steering column.

The rack is loaded all the time the car is moving: force from the wheels passes through the tie rods into the housing, and the housing rests on the bushings. Once the material has sagged or worn, the housing starts to shift slightly against its mount, and part of the steering wheel travel is spent taking up that play instead of turning the wheels. Hence the vague on-centre feel, the knock over joints and the uneven response to small inputs.

 

Signs of Worn Steering Rack Bushings

Worn steering rack bushings rarely fail suddenly — the play builds up slowly and the driver gets used to it. The simplest check needs two people: one rocks the steering wheel gently within the free play while the other watches the rack housing and its mounting points.

  • a knock or dull double impact near the rack over small bumps and joints
  • increased free play at the wheel, the car wanders in ruts when driven straight
  • delayed response to small steering inputs and constant correction
  • visible movement of the rack housing against the subframe while rocking the wheel
  • cracks, material pushed out of its seat, rubber debris around the mount
  • uneven front tyre wear and alignment that drifts with no obvious cause

These symptoms overlap with worn tie rods and ends, so the whole assembly is inspected.

 

Polyurethane or Rubber

The factory steering rack bushing is usually rubber. Rubber is soft and absorbs small vibration well, but under constant load and in contact with oil, road salt and engine heat it hardens, cracks and shrinks. That shrinkage is exactly what creates the play felt at the steering wheel.

Polyurethane is denser and more resistant to abrasion, oils and temperature swings, so the geometry of the seat holds far longer and the rack housing stays where it belongs. The trade-off is slightly more fine vibration reaching the steering wheel, and in practice the difference shows mainly on broken surfaces. For cars driven hard, for commercial vehicles and for high-mileage machines that trade is usually worth making: steering becomes more precise and more predictable. The Shore hardness is listed on every product page.

 

How to Choose a Rack and Pinion Bushing

Selection is driven by dimensions and mounting type, not by the car badge. Remove the old part, measure it and compare it with the drawing; we can also copy a sample.

By Dimensions and Fit

The key figures are the inner diameter for the shaft or mounting bolt, the outer diameter of the seat, the length of the bushing and the flange height where the design has one. Measure the worn part with a caliper in two planes: after years of service the seat often goes oval, so the largest reading and the bore in the housing are taken as the reference. If the old bushing has crumbled away, dimensions are taken directly from the rack housing and from the subframe mounting eye. From a drawing, a sample or a worn part we produce custom-made items from a single piece.

By Durometer

Durometer is chosen to match how the vehicle is actually used and how much load it carries. For a city car driven calmly, a grade closer to the factory part in comfort makes sense: it restores steering precision without adding noise inside the cabin. For cars driven hard, for vans and for light commercial vehicles that run loaded, a firmer grade is the logical choice — it deflects less under side load and holds the geometry of the assembly for longer. The exact Shore value for each item is given on its product page, so grades can be compared directly in the catalogue.

By Mounting Type and Set Size

Steering rack bushings come as one-piece, split and two-half designs, and the last of these can be fitted without dropping the rack from the car. A separate distinction is the metal outer sleeve: a sleeved bushing sets a rigid outer fit in the housing, while a sleeveless one bears directly on the metal of the mount. Check the part count in the assembly as well: there are usually two or four, and replacing them as a set is the sensible approach, since a fresh bushing next to a worn one wears out quickly. While the rack is apart, renew the steering rack boot if it is damaged.

Why Buy Rack and Pinion Bushings from PolyPro — Retail and Wholesale

PolyPro is a manufacturer, not a reseller. Tooling, casting, dimensional inspection of finished parts and sales all happen without intermediaries, so the part reaches you straight from production. Retail orders go by the piece: one bushing, a pair for the mount or the full set. If the size you need is not in stock, the part is produced from a drawing, a sample or the worn bushing itself — again from a single piece. Our products carry a warranty and we ship internationally.

On the wholesale side we work with repair shops, parts retailers, fleets and resellers. The partner programme gives bonuses for turnover or for the size of a single order, access to prices and stock levels, and shipment under the partner's own brand.

 

Frequently Asked Questions

How many bushings does a steering rack use? 

It depends on the design. Most often the housing is clamped at two points, so there are two bushings; on some models the mount is a three-part arrangement, or each point takes a pair, which makes four. The exact count is established on the assembly itself once the undertray is off, rather than from a generic diagram.

Can the bushings be replaced without removing the rack? 

That depends on the part type and on access to the mount. Split bushings and two-half designs are made specifically for replacement in place: the housing is loosened, lifted slightly and the new halves are fitted around it. A one-piece bushing cannot go in that way, so the rack has to come out. The old part shows which type you have.

What does switching from rubber to polyurethane change? 

The play caused by sagging rubber disappears, so the steering answers more precisely near centre and the knock over joints and small bumps fades or stops completely. Polyurethane is less affected by oils, road salt and heat, so the seat keeps its geometry longer. In exchange, slightly more fine vibration reaches the steering wheel.

Is a wheel alignment needed after replacement? 

Yes, it is worth checking. Changing the position of the rack housing affects the length of the tie rods relative to the steering knuckles, and therefore front wheel toe. If the old bushings were badly worn, the angles have almost certainly drifted. The check is done after the mounts are torqued with the car standing on its wheels.

How do I tell the rack is knocking and not the tie rods? 

A knock from the bushings is usually a double sound heard near the bulkhead when crossing small bumps. With the car parked, have someone rock the wheel within the free play while you hold a hand on the rack housing: movement of the housing against the subframe points to the bushings, play felt in the joints points to the rods and ends.

Will a bushing fit if my model is not listed? 

Selection goes by dimensions, not by the badge on the car. Remove the old part, measure the inner and outer diameters, the length and the flange height, then compare them with the items in this category. If nothing matches, the part is produced from a drawing, a sample or the worn bushing, including as a one-off.

Can I buy a single bushing? 

Yes. Retail is per piece: one bushing, a pair for the mount or a complete set. Non-standard sizes are made from a drawing, a sample or a worn part, again starting from one piece. Our products carry a warranty and we ship internationally. The Shore hardness of each item is stated on its product page.

What are the terms for repair shops and parts retailers? 

Wholesale supply goes to repair shops, parts retailers, fleets and resellers. The partner programme opens access to prices and stock levels, bonuses for turnover or for the size of a single order, and shipment under the partner's own brand. Terms are agreed case by case.