Allison 1000 Transmission Stage 4 900+ HP Max
Stage 4 Allison 1000 - 900+HP
2001-2019 Duramax
SCROLL DOWN FOR BUILD SPECS
- 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.
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.
Buy Now, Pay Later
We know that upgrading your transmission is a big investment and paying all at once can be tough. That’s why we’ve teamed up with Affirm to make it easier for you. With our financing options, you can enjoy the benefits of a top-quality transmission without the stress of a hefty upfront payment. Available exclusively online, just choose Affirm at checkout and spread your payments out over time. Get the performance you need today, and pay at a pace that fits your budget.
1-Year / 12,000 Mile Warranty
At Randy’s Transmissions, we stand behind the quality and durability of every transmission we build. The Stage 3 Allison transmission comes with a 1-year, 12,000-mile warranty, giving you peace of mind that your investment is protected. Whether you’re towing heavy loads or pushing your truck to the limit on the track, you can rely on our proven performance and customer support. Our commitment to excellence ensures that your transmission will perform as expected, mile after mile.
Refresh Program
At Randy’s, we believe in long-term relationships, not just one-time transactions. That’s why our Refresh Program is here to support you even after your warranty expires. When your transmission needs a little TLC, we’ll give it a thorough rebuild at a fraction of the cost of a new unit. It’s our way of showing our commitment to your vehicle’s performance and your satisfaction. Please remember, this program is available only to the original owner and is non-transferable. With Randy’s, you’re not just buying a transmission; you’re investing in lasting peace of mind and continued excellence on the road.
WARRANTY
1 Year 12,000 mile limited warranty will not cover broken cases or shafts of transmission. Abuse, misuse, or burn down due to operator error will void warranty. Any warranty work must be performed at Randy’s Transmissions in Tooele UT. It is the vehicle owner’s responsibility to ship transmission or vehicle to Randy’s location for any and all repairs needing to be performed. Any repairs to transmission not authorized by Randy’s Transmissions will void warranty and will not be covered by Randy’s Transmissions.
WARRANTY IS NON-TRANSFERRABLE
Appropriate gear ratios
- 35" tire min gearing is 3:73 recommended 4:10
- 37" tire min gearing is 4:10 recommended 4:30
- Larger than that should be running a 4:56 ratio