Steering gear — commonly a rack-and-pinion assembly on passenger cars — translates the rotation of the steering column into the lateral movement that turns the front wheels. The pinion meshes with a toothed rack, and on hydraulically assisted or electro-hydraulic systems an integral valve controls fluid pressure to amplify the driver's input. Internal wear in the rack teeth or pinion bearing is gradual, but once slack develops it shows up immediately as increased play at the steering wheel: a range of dead-ahead movement before the wheels actually respond. Shaftec and Bosch are among the major suppliers of replacement steering gear carrying OE-equivalent specifications, including rack travel, mounting dimensions, and power-steering port positions that must match the original to avoid hydraulic leaks or incompatible column angles. Hydraulic racks can also develop fluid weeping at the gaiters before mechanical play becomes apparent, and this is worth catching early because contaminated road grit accelerates rack-tooth wear once a gaiter tears. Renewing the gear to the correct OE number ensures the replacement unit is pre-set to the same centre-point and lock-to-lock specification as the vehicle's steering geometry was designed around, so tracking alignment after fitting corrects only road-induced drift rather than correcting for an undersized unit.
Steering racks vary between left-hand and right-hand drive, between power-assisted and unassisted variants, and sometimes between model-year revisions. The OE reference on this page is TecDoc-verified against your specific chassis code and engine variant. Use your vehicle's VIN or the model-year filter to confirm the listing matches your build before ordering — an incorrectly specified rack may have different port positions or lock-to-lock ratios, which cannot be resolved by alignment alone.
OEM steering racks are manufactured or validated by the vehicle builder and carry the exact production OE number. Quality aftermarket units from Shaftec or Elstock are typically remanufactured from original cores and tested to the same dimensional and pressure specifications. A remanufactured unit supplied with an exchange core deposit can represent good value, as the internal components are renewed while the housing retains its original geometry. Cheap units without traceable OE references sometimes ship with mismatched port fittings or incorrect rack stroke, creating fitment problems at installation.
Yes, a four-wheel alignment check is always required after a steering rack replacement. The replacement unit sets the rack in a new centre position and any tolerance variation in the mounting will shift the toe setting on both front wheels simultaneously. Even a small toe change causes rapid tyre wear and can make the car feel as though it wants to wander in a straight line. The alignment process takes the rack replacement into account and corrects the toe back to the vehicle manufacturer's specification for your chassis.
Excessive free play at the steering wheel — where you can move the wheel several centimetres in either direction before the front wheels respond — is the clearest sign of rack wear. Other symptoms include a knocking or clonking through the steering column over uneven surfaces, fluid staining on the gaiters or subframe on hydraulically assisted cars, and a vague or inconsistent on-centre feel at motorway speeds. In severe cases a worn rack can produce intermittent lock-up at full steering lock, which is a safety concern requiring immediate attention.
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