Allison 1000 Transmissions

The Allison 1000 is one of the most respected heavy-duty automatic transmissions ever installed behind the legendary Duramax diesel engine. Found in Chevrolet Silverado HD and GMC Sierra HD trucks from 2001-2019, the Allison 1000 has earned a reputation for durability, towing capability, and long service life.

At Twisted Torque, we offer remanufactured Allison 1000 transmissions built for stock replacement, heavy towing, commercial use, and performance applications. Every transmission is carefully inspected, upgraded, and assembled using quality components to provide dependable operation whether you're hauling equipment, towing a trailer, or building a high-performance diesel truck.

From daily drivers and work trucks to modified Duramax builds, our Allison 1000 lineup is designed to deliver the reliability and performance diesel owners demand. Browse our available build levels below and find the right transmission for your application.