GM is taking the unprecedented step of removing some of the badging on its unsold trucks starting in 2026. Here’s how GM ended up in this weird situation.
Allison transmissions have been a valued component used in General Motors’ heavy-duty trucks since 2001. What is not generally well-known is that GM was the owner of Allison for a period that started in 1928 and ended in 2007, when Allison was purchased by the Onex Corporation and the Carlyle Group, a global private equity firm. Allison was also connected to Detroit Diesel during a part of its history.
As of June 29, 2026, which represents the end of the 180-day sell-down period that follows the December 31, 2025, conclusion of GM’s branding agreement with Allison, no Allison badging will be permitted on any Chevrolet or GMC heavy-duty trucks remaining in inventory. This means that any Allison transmission-equipped trucks must have their Allison badges removed. GM has stated that it will «initiate a field action to retrofit any remaining Allison-badged inventory with a non-Allison badge.
