Say it isn’t so! Hearts are breaking around the world as General Motors breaks up with Allison Transmission. Chevrolet and GMC trucks have been proudly wearing the Allison name since 2001. Now heavy-duty trucks are saying goodbye. 

General Motors and Allison Transmission split up 

When it comes to heavy-duty, diesel-powered trucks, the Allison Transmission is legendary. Chevrolet Silverado models and GMC Sierra models are very familiar with these transmissions. 

General Motors partnered with Allison Transmission because of its expertise in converting tons of torque into forward motion. They help the Duramax diesel and gas-powered V8 engines reach higher towing and power ratings. 

But the Allison-built transmissions have already been replaced by a 10-speed General Motors transmission that rolled out in 2020. Now the partnership is officially ending on January 1, 2026. 

The 10L1000 transmission is built by General Motors. However, the design was checked and approved by Allison. Not me, the transmission company. I’m not sure if General Motors remembers that I exist after getting the Sierra EV stuck in the mud. 

According to The Fast Lane, a licensing agreement said the branding would be included on the new generation of 2020+ HD trucks. 

The heavy-duty vehicles will stop being built with the Allison badging after June 29, 2026. Then, trucks built before this date with the badges will be hunted down to be debranded. Models built in 2025 that are unsold will have to wear the badges until then. 

General Motors has been using the badging for marketing and to appeal to loyal truck drivers. However, are folks still buying trucks based on loving a certain transmission supplier? But Allison Transmission will live on with projects related to the Abrams Main Battle Tank.