General Motors and Allison Transmission share a long history, but that's all going to change at the end of this year. Here's ...

Next year, heavy-duty GM trucks will lose their Allison badges, even though the transmissions themselves won't change.

The two brands have worked together for decades, but they couldn't reach an agreement to extend their longstanding licensing deal.

After more than two decades working together, General Motors and Allison Transmission are officially splitting up.