After decades of gm hd trucks using allison transmissions, the partnership is ending on december 31, 2025 due to not coming to an agreement. General motors and allison are ending a partnership that can be traced back nearly a century 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. Gm's detroit diesel division purchased allison transmission back in 1970
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