GM / Allison Transmission Class Action Lawsuit

Mahoney Law Group, APC filed a class action lawsuit on behalf of it clients and proposed class against General Motors, General Motors, LLC, Allison Transmissions.

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Case Evaluation

If you own or lease a 2020–2026 Chevy Silverado 2500 HD, Silverado 3500 HD, GMC Sierra 2500 HD, or Sierra 3500 HD with an "Allison" badge, you may have a claim.

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Class Action

GM & Allison Transmission Lawsuit

Mahoney Law Group, APC filed a class action lawsuit on behalf of its clients and proposed class against General Motors, General Motors, LLC, Allison Transmissions, Inc., and Allison Ventures (collectively “Defendants”).

The lawsuit targets General Motors Chevy Silverado 2500 HD, Silverado 3500 HD, GMC Sierra 2500 HD, and GMC Sierra 3500 HD models for the years 2020 through January 2026. GM and Allison prominently advertised these heavy-duty trucks as containing a premium, authentic “Allison” manufactured transmission system.

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Case Overview

The Plaintiff’s lawsuit alleges that owners paid a luxury premium based on deceptive marketing practices. Our investigation centers on the following tenets:

Key Details:Assessing whether the ongoing performance errors stem from an engineering or manufacturing fault.
Representation: Addressing allegations that Defendants hid the fact that the system is an in-house GM production badged falsely with an Allison stamp.
Contact Us: Ensuring compensation for drivers burdened with repair costs who never received the market value of their original purchase.

The following truck models and year ranges are covered by the lawsuit.