For decades, few powertrain combinations have commanded as much respect in the heavy-duty truck world as the Duramax diesel engine paired with an Allison transmission. For many GM truck buyers, that Allison badge on the hood wasn't just marketing—it was the primary reason for the purchase.
However, recent developments have revealed that this legendary partnership is coming to a definitive end. The "divorce" between General Motors and Allison Transmission is final, and it's shedding light on a confusing few years for GM truck owners.