After decades of gm hd trucks using allison transmissions, the partnership is ending on december 31, 2025 due to not coming to an agreement. Allison products are specified by over 250 vehicle manufacturers and are used in many market sectors, including bus, refuse, fire, construction, distribution, military, and specialty applications. The longstanding partnership between general motors (gm) and allison transmission is set to end after this year This development will see the chevy silverado hd and gmc sierra hd models drop the. After more than two decades working together, general motors and allison transmission are officially splitting up. After more than 20 years of collaboration, gm and allison transmission will end their licensing agreement at the end of 2025.
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