The part of the parallelogram steering mechanism that provides the adjustment point for adjusting the toe setting is the: a. Pitman arm. b. Tie rod. c. Idler arm. d. Adjustment sleeve.

The correct answer. Adjustment sleeve.<br /><br />In a parallelogram steering mechanism, the adjustment sleeve is the component that provides the adjustment point for adjusting the toe setting. The toe setting refers to the angle of the wheels when the vehicle is moving straight ahead, and it is important for ensuring proper tire wear and handling.<br /><br />The adjustment sleeve is typically located on the tie rod end and can be rotated to change the angle of the tie rod. By adjusting the toe setting using the adjustment sleeve, the alignment of the wheels can be fine-tuned to achieve the desired handling characteristics and tire wear.<br /><br />The other options provided, such as the Pitman arm, tie rod, and idler arm, are also components of the parallelogram steering mechanism. However, they do not provide the adjustment point for the toe setting. The Pitman arm is connected to the steering box and converts the rotational motion of the steering wheel into linear motion. The tie rod connects the steering linkage to the wheel hub and allows for the transfer of motion. The idler arm is a pivot point that allows the steering linkage to change direction.<br /><br />In summary, the adjustment sleeve is the component in a parallelogram steering mechanism that provides the adjustment point for adjusting the toe setting.