TOYOTA 43235-60020 Steering Knuckle Kingpin Bearing Shim

The genuine OEM part with part number Toyota 43235-60020 is a premium quality, precision steering knuckle / kingpin bearing shim (OEM raw name: SHIM, STEERING). This component plays a vital role in the precise adjustment of the steering knuckle (swivel hub) assembly on vehicles equipped with a solid front axle.

Operation and Function

The primary purpose of the kingpin bearing shim is the accurate adjustment of kingpin bearing preload. Proper preload is essential for ensuring that the steering knuckle rotates smoothly and securely without play or binding. Precise shimming directly affects the vehicle's straight-line tracking and steering stability while preventing undesirable suspension vibrations (such as steering shimmy or wobble).

Technical Characteristics and Specifications

• Manufacturer: TOYOTA (Genuine OEM Part)
• Part Number: 43235-60020
• Part Type: Steering Knuckle / Kingpin Bearing Shim (Shim, Steering)
• Fitting Position: Front axle, at upper and lower kingpin bearings (applicable to both sides)
• Material: High-tensile, wear- and corrosion-resistant calibrated sheet steel
• Application: Used for fine-tuning bearing clearance and preload torque during assembly

Symptoms of Failure and Importance of Replacement

While the shims themselves do not experience direct mechanical wear, the shimming must be re-checked and adjusted whenever the suspension is serviced, kingpin bearings are replaced, or steering knuckle seals are overhauled. Improper shimming can lead to the following issues:

• Too loose adjustment: Wheel play, loose or vague steering feel, increased tire wear, and steering wheel wobble/shimmy.
• Too tight adjustment: Heavy or stiff steering, failure of the steering wheel to self-center after cornering, and premature overheating and failure of the kingpin bearings.

To ensure safe and durable suspension performance, the use of genuine Toyota shims is always recommended during repair work, following factory specifications for torque values and clearances.