2018 GMC Sierra 2500HD Wheel Alignment Specifications

Quick reference

Adjustability

On the 2018 GMC Sierra 2500HD, front toe is the primary factory adjustment. This is achieved by adjusting the tie rod ends. Front camber and caster are technically adjustable from the factory, but often require specialized knowledge and equipment. The lower control arm mounts on the frame allow for some camber and caster adjustment by loosening and shifting them. However, for significant changes or to bring a vehicle with worn components into specification, aftermarket cam bolts or eccentric bushings for the lower control arms might be necessary. Some technicians may slot bolt holes to gain additional adjustment, but this is a modification and not a factory adjustment.

The rear axle on the 2018 GMC Sierra 2500HD is a solid axle design, meaning there are no factory adjustments for rear camber, toe, or caster. Any issues with these angles on the rear typically indicate bent axle housing, worn leaf springs, or damaged suspension mounts.

Recommended adjustment hardware

While some front camber and caster adjustments can be made by shifting the lower control arm mounts, installing aftermarket eccentric cam bolt kits, such as those from SPC Performance, can provide a wider range of adjustment and make future alignments easier. These kits replace the factory lower control arm bolts and allow for precise camber and caster changes without constantly loosening and shifting the entire control arm. For rear axle thrust angle issues not caused by damage, often replacing worn leaf spring bushings or U-bolts can help, as these impact how the axle sits under the truck.

Symptoms of bad alignment

Misalignment on your 2018 GMC Sierra 2500HD can manifest in several ways, often most noticeably through tire wear. Uneven tire wear is a tell-tale sign that your alignment is off. For instance, excessive positive or negative camber will cause wear on the outer or inner edge of the tire, respectively. Incorrect toe settings are a major culprit for rapid and uneven tire wear; too much toe-in or toe-out will cause feathering or scrubbing across the tread. If you notice the steering wheel isn't centered when driving straight, or if the vehicle pulls to one side, these are strong indicators of an alignment problem. A crooked steering wheel often points to an issue with total toe or an inconsistency in individual toe settings between the front wheels. A pull to one side can be caused by significant camber or caster differences between the left and right sides. You might also experience a loose or wandering feeling in the steering, or even excessive vibration at certain speeds, all of which could stem from an improper alignment.

When to align

It's recommended to get an alignment check whenever you have new tires installed, as proper alignment will maximize their lifespan. Any time you replace steering or suspension components, such as tie rods, ball joints, control arms, or even shock absorbers, an alignment is crucial. Hitting a large pothole, curb, or being involved in a minor accident can also throw your alignment out of specification, so it's wise to have it checked afterward. Even if you don't experience any obvious symptoms, it's generally a good practice to have your alignment inspected annually to catch any minor shifts before they lead to significant tire wear or handling issues.

Typical alignment cost

The cost of a wheel alignment for your 2018 GMC Sierra 2500HD can vary depending on your location, the shop, and whether any adjustments beyond basic front toe are required. Generally, you can expect to pay anywhere from $80 to $150 for a standard four-wheel alignment. If additional parts like cam bolts are needed or if significant labor is involved in freeing seized components, the cost could be higher. Always ask for a detailed estimate before any work begins.

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