Product description
Recommended to add transmission cooler & Billet Flexplate to order.
Sales Tech will call to verify build details.
Stage 4 Allison Transmission – Built for Serious Horsepower
Street & Track Dominator for Chevy & GMC Duramax Trucks
The Stage 4 Allison 1000 is engineered for Duramax owners who demand top‑tier performance in every environment. Rated for 900+ horsepower, this transmission is built for drivers who thrive on big power and need a drivetrain capable of handling extreme street use and aggressive track passes. If you’re pushing your Duramax to the edge, this is the transmission designed to keep up.
Street & Track Performance – Key Features
Raybestos or ALTO G3 C‑3/C‑4 Torque Kit with custom‑machined pressure plates for maximum clutch capacity and holding strength
LML‑Style Pistons & Return Springs for quicker, cleaner shifts at high power levels
Raybestos or ALTO G3 C‑1/C‑2 Torque Kit for consistent engagement under heavy load and high RPM
Ratio Tek Pressure Upgrades to stabilize hydraulic pressure and improve reliability in extreme conditions
Transgo Trim Valves for precise pressure control and refined shift quality
New Torrington Bearings to reduce friction and extend component life under stress
Randy’s Torque Converter with Billet Stator, with custom stall options tailored for street or track performance
Billet Input Shaft, Billet C‑2 Hub & Billet Output Shaft for unmatched torque handling
Billet P‑2 Planet for added durability in high‑horsepower applications
Heavy‑Duty Cast Aluminum Deep Pan for improved cooling and increased fluid capacity
New OE Filters to maintain clean, efficient fluid flow during high‑performance operation
Unleash Maximum Performance
Years of development and hands‑on testing have shaped the Stage 4 Allison into one of the strongest street‑and‑track transmissions available for the Duramax platform. Every component is selected to support extreme horsepower while maintaining smooth, predictable operation. When you choose Randy’s, you’re choosing a transmission proven through real‑world abuse and continuous refinement.
Why Choose Randy’s Stage 4 Allison Transmission?
Randy’s Transmissions builds performance units that are engineered—not guessed. The Stage 4 Allison is the result of extensive research, rigorous testing, and countless hours of real‑world evaluation. From street pulls to track passes, this transmission has been pushed to its limits to ensure it delivers exceptional strength and reliability. It’s the ideal choice for enthusiasts who want the strongest possible Allison for high‑power builds.
1‑Year / 12,000‑Mile Warranty
Your Stage 4 Allison transmission is backed by a 1‑year, 12,000‑mile warranty, giving you confidence that your investment is protected. Whether you’re towing, racing, or daily driving with serious horsepower, you can rely on Randy’s proven durability and customer support. Every unit is built to perform mile after mile.