After decades of gm hd trucks using allison transmissions, the partnership is ending on december 31, 2025 due to not coming to an agreement. 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.
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The longstanding partnership between general motors (gm) and allison transmission is set to end after this year
