A GMC Sierra 1500 owner is stunned that his diesel truck delivers a "shockingly good" 23.5 MPG on logging roads, even with ...

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

A 2025 GMC Sierra 3500 AT4 owner is reeling after his brand-new diesel dropped from 24 MPG highway to a measly 17 MPG, and ...

SEMA 2025 is live in Las Vegas, showcasing the latest truck and diesel-performance parts, accessories, and innovations that ...

Break up alert! General Motors is done with Allison Transmission as their contract ends. They'll no longer wear that ...

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

When GM launched new-generation trucks for the model year 2020, the Allison automatic was gone. The trucks still got the badge, but it was a new 10-speed automatic jointly developed by Ford and GM. So ...

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

Having worked through the data, we may have just found the most reliable diesel engine going into 2026. As it stands, there are five diesel engines on sale in the USA today going into next year, each ...

For decades, Americans have relied on pickup trucks not just as workhorses, but also as loyal companions on the road. Whether it’s hauling equipment, towing boats, or simply handling day-to-day family ...