GM and Allison Transmission, longtime partners on heavy-duty truck powertrains, are parting ways, as first reported by TFL Truck. The rollout of GM's 10-speed automatic in 2020 marked the end of ...
After decades of GM HD trucks using Allison Transmissions, the partnership is ending on December 31, 2025. This news comes at a shock to many GM truck fans who think highly of Allison Transmissions ...