Technician A says rear camber may be adjusted using shims. Technician B says rear toe may be adjusted using shims. Who is correct?

The correct answer is that both technicians are correct, as shims can be used for adjustments in both rear camber and rear toe.

Rear camber refers to the angle of the wheel in relation to the vertical axis of the vehicle. When adjusting rear camber, shims can indeed be inserted between the rear control arms and the chassis or the axle to increase or decrease the camber angle. This allows for precise tuning of the suspension geometry, which is essential for optimizing tire wear and handling characteristics.

Similarly, rear toe refers to the angle at which the wheel points relative to the centerline of the vehicle. Adjustments to rear toe can also be made using shims, particularly in setups where the rear suspension allows for such modifications. Shimming can help in altering the alignment to ensure that the wheels are properly aligned for optimal handling and tire longevity.

In practical terms, both adjustments help in fine-tuning the vehicle's handling, stability, and tire wear characteristics, making it possible for both technicians to be right in stating that rear camber and rear toe may be adjusted using shims.