2022 Peterbilt 579 Wheel Alignment Specifications

Quick reference

Adjustability

On a 2022 Peterbilt 579, the front axle alignment is highly adjustable from the factory. Front caster is adjusted via shims on the front axle control arms. Front camber is typically non-adjustable from the factory and requires aftermarket eccentric bushings to allow for adjustment. Toe is easily adjustable on the front axle by loosening the clamp bolts on the tie rod and rotating the tie rod itself.

The rear axles on a Peterbilt 579 are typically non-adjustable for camber or caster. However, rear toe and thrust angle can be adjusted. This is done by loosening the axle mounting bolts and using a specialized alignment tool to shift the axle into the correct position. This process, often called a "tandem alignment," is critical for ensuring the rear axles are running parallel to each other and perpendicular to the chassis centerline.

Recommended adjustment hardware

For front camber adjustment, which is not factory-adjustable, mechanics will often use aftermarket eccentric bushings. These bushings replace the stock bushings in the steer axle and allow for a range of camber adjustment. For caster adjustments, factory shims are typically sufficient.

Symptoms of bad alignment

Misalignment on a heavy-duty truck like the Peterbilt 579 will quickly lead to expensive tire wear and can create unsafe driving conditions.

• Feathered Wear: This pattern, where the tread blocks are worn higher on one side and lower on the other, is a classic sign of incorrect toe. If you run your hand across the tire, it will feel smooth in one direction and sharp in the other.
• One-Sided Shoulder Wear: If the inside or outside shoulder of the tire is wearing down significantly faster than the rest of the tread, this is a strong indicator of a camber issue. Positive camber wears the outside shoulder, while negative camber wears the inside.
• Cupping or Scalloping: This pattern of random, uneven dips in the tread is often caused by a combination of misalignment and worn suspension components like shock absorbers or wheel bearings. Incorrect caster can also contribute to this type of wear.
• Vehicle Pull: A constant pull to one side while driving on a flat, straight road is a common symptom. This can be caused by incorrect caster, camber, or a significant thrust angle issue from the rear axles.

When to align

It is recommended to have the alignment checked and adjusted in the following situations:

• After installing new tires: To protect your investment and ensure even wear from the start.
• After any suspension or steering component replacement: This includes kingpins, tie rod ends, control arm bushings, or any work on the axle itself.
• After a significant impact: Hitting a large pothole, curb, or other road hazard can easily knock the alignment out of specification.
• Regularly as part of preventative maintenance: For a commercial vehicle like the 579, alignment checks should be part of the regular maintenance schedule, typically every 50,000 to 60,000 miles or at least once a year.

Typical alignment cost

The cost for a commercial truck alignment varies based on location and the specific work needed. A standard front-axle (steer axle) alignment typically costs between $250 and $400. A full tandem alignment that includes the rear axles will be more expensive, generally ranging from $500 to $800, as it is a more labor-intensive process.

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