Gm's detroit diesel division purchased allison transmission back in 1970 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.
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After decades of gm hd trucks using allison transmissions, the partnership is ending on december 31, 2025 due to not coming to an agreement.
