Randy's Transmissions - Allison 1000 6-Speed Stage 4 (900+HP) Transmission + Torque Converter
Part # 311241035-L5P
Built for the True Horsepower Enthusiast
Street & Track Dominator for Chevy & GMC Duramax Pickups
The Stage 4 Allison 1000 Transmission, rated for 900+ horsepower, is engineered for those who demand superior street and track performance. If you live for horsepower and want a transmission that can handle it all, this is the ultimate choice. Designed to deliver maximum power transfer and hold up under extreme conditions, the Stage 4 is for the true enthusiast pushing their Duramax to its limits.
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 power, perfect for high-horsepower applications.
- LML Style Pistons and Return Springs for faster, smoother shifts, ensuring peak performance on both the street and track.
- Raybestos or ALTO G3 C-1/C-2 Torque Kit delivering consistent, high-performance engagement under heavy loads and high speeds.
- Ratio Tek Pressure Upgrades to optimize fluid control and ensure reliable performance under extreme conditions.
- Transgo Trim Valves for precise control and superior shift quality.
- New Torrington Bearings for reduced friction and extended life under heavy stress.
- Randy’s Torque Converter with Billet Stator, custom stalls available for dialing in optimal performance for street or track.
- Billet Input Shaft, C-2 Hub, and Output Shaft for unmatched strength to handle extreme torque.
- Billet P-2 Planet for superior durability.
- HD Cast Aluminum Deep Pan for enhanced cooling and increased fluid capacity to keep things running smooth under pressure.
- New OE Filters to maintain clean fluid flow, essential for high-performance operation.
Unleash Maximum Performance
After years of R&D, we’ve perfected the art of building the strongest Allison 1000 transmission for street and track warriors. When you choose Randy’s, you’re choosing proven performance, reliability, and innovation born from relentless testing and refinement.
Why Choose Randy’s Stage 4 Allison Transmission?
At Randy’s, we don’t just build transmissions—we engineer them to exceed your expectations. Our Stage 4 Allison is the product of years of research, testing, and real-world experience. We’ve put this transmission through the wringer, on the street, track, and under extreme horsepower applications to ensure it’s the best in its class. This is why Randy’s Stage 4 Allison is the ultimate choice for true horsepower enthusiasts.
Warning: cores must be like-for-like - A 5-Speed core will not be accepted for a 6-Speed transmission or vice-versa.
