Complete Allison 10L1000 Transmissions

The Allison 10L1000 transmission is an amazing piece of machinery that helps your Duramax L5P Sierra or Silverado feel amazing. However, even this 10-speed iteration of the Allison can struggle the huge levels of horsepower and torque that your 6.6L Duramax can thrown down with even a few basic performance modifications. That's where Tier One's built Allison 10L1000 transmissions come in. Tier One's performance 10L1000 transmissions come with a whole host of performance and reliability upgrades that allow them to handle a bunch more power than stock, all while handling heavy towing and hauling applications without breaking a sweat. Tier One's 10L1000 transmissions range from budget-friendly towing transmissions meant to improve reliability at stock power levels to high-performance 10L1000 transmissions that can handle over 700 crankshaft horsepower. Make sure to also check out our Allison 10L1000 Transmission Coolers or our Allison 10L1000 Transmission Pans!