Allison Stage 2 Freedom Series 750HP 2001-2019 (WHOLESALE)

The Allison Stage 2 Freedom Series from Next Level Engine & Transmission is designed for 2001–2019 Duramax-equipped trucks producing up to 750 horsepower. This transmission is the perfect upgrade for tuned and performance-driven builds that need reliable power handling, improved shift quality, and increased durability for towing or street use.

Each transmission is assembled by a master technician  using upgraded billet and performance components to ensure strength, precision, and consistent performance under heavy load. Once complete, the technician personally signs the transmission — a lasting symbol of pride and craftsmanship that represents the Next Level standard.

The Allison Stage 2 Freedom Series delivers crisp shifts, consistent pressure, and dependable operation for trucks that push beyond stock limits — built strong to perform, tow, and last.

Recommended For

• 2001–2019 Duramax trucks
  
• Tuned and performance builds up to 750 HP
  
• Heavy towing and street performance applications
  
• Drivers who want strong, smooth, and reliable performance
  
• This Transmission Features The Following:

Tear Down & Cleaning:

• The transmission is fully disassembled, and all soft, wear-prone parts are replaced with brand-new, high-quality components.
  
• Cases and housings are deep-cleaned in a 190° hot wash system to remove all residue and contaminants.
  
• Hard parts are hand-inspected and cleaned individually, with any questionable components replaced before reassembly.
  
• The case is thoroughly checked for cracks, wear, or damage to ensure a flawless foundation for the build.
  

Upgraded Internal Components:

• Raybestos or ALTO G3 C-3 C-4 Torque kit custom machined pressure plates
• LML style pistons and return springs
• Raybestos or ALTO G3 C-1, C-2 Torque kit
• Ratio Tek pressure upgrades
• Transgo trim valves
• Next Level Transmission Blacklist Torque converter
• New OE filters
• New OEM Bearings
• HD Cast Aluminum deep pan
• Next Level Custom Paint

Warranty:

Includes: a 2-year / unlimited miles warranty. 

Note:

Next Level Engine & Transmission reserves the right to alter, update, or substitute build components and specifications at its discretion, without prior notice or obligation. These adjustments may be made to help customers meet specific timelines while maintaining the highest standards of quality, durability, and efficiency. 

Returns:

*We accept returns within 10 days of receipt, as long as the transmission is in like-new condition and has not been installed. Please note that a 25% restocking fee applies, and customers are