TechnicianVision · Knowledge base
Two-Wheel vs. Four-Wheel Alignments
I-CAR · May 19, 2021
Summary
This article explains that a four-wheel alignment is necessary for all vehicles, regardless of whether they have an adjustable independent rear suspension or a non-adjustable solid rear axle. Checking all four wheels is critical to identify hidden structural or suspension damage, correct or align to the rear thrust angle, and prevent issues with tire wear, steering wheel centering, and ADAS functionality.
What to do on the job
Always perform a four-wheel alignment (or thrust-angle alignment for solid rear axles) rather than a simple two-wheel alignment to ensure the front wheels are aligned to the rear thrust angle and to verify the rear suspension is within OEM specifications.
How to use it
Use this document to justify the necessity of a four-wheel alignment over a two-wheel alignment on an estimate or supplement, especially for vehicles with solid rear axles. It serves as authoritative proof that referencing all four wheels is required to ensure proper vehicle handling, prevent ADAS calibration failures, and detect hidden structural or suspension damage.
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