Allison 1000 Transmission Stage 3 900HP Max

Stage 3 Allison Transmission for Chevy & GMC Duramax Pickups

Tow and Race Ready – Built for 900 HP

The Stage 3 Allison transmission is engineered for the Duramax owner who demands the best of both worlds: heavy-duty towing capability and high-performance racing readiness. Whether you’re pulling a heavy load or pushing your truck to the limits on the track, this transmission is built to deliver reliable performance with precision and power. Rated for up to 900 horsepower, the Stage 3 Allison is the ultimate transmission upgrade for serious Duramax enthusiasts.

Built for Strength and Performance

With custom-machined pressure plates, upgraded clutch packs, and billet components, the Stage 3 Allison transmission is designed to handle extreme power while maintaining smooth, reliable shifting. Our focus on durability and power delivery ensures that your truck is ready for any challenge, whether you’re towing or hitting the drag strip.

Top-Tier Components for Maximum Durability

• Raybestos or ALTO G3 C-3 and C-4 Torque Kit with custom-machined pressure plates
• LML Style Pistons and Return Springs for enhanced performance under heavy load
• Raybestos or ALTO G3 C-1, C-2 Torque Kit for increased clutch holding capacity
• Ratio Tek Pressure Upgrades for improved hydraulic performance and reliability
• Transgo Trim Valves for precise pressure control and enhanced shifting
• New Torrington Bearings for reduced friction and extended lifespan
• Randy’s Torque Converter with Billet Stator with custom stall options for towing or racing
• Billet Input Shaft for maximum torque transfer and durability
• Billet C-2 Hub to handle extreme power loads
• Heavy Duty Cast Aluminum Deep Pan for superior fluid cooling and capacity

Why Choose Randy’s Stage 3 Allison?

Randy’s Transmissions takes pride in building the most reliable, high-performance transmissions on the market. Our Stage 3 Allison transmission is rigorously tested to ensure it holds up under extreme conditions, whether you’re hauling a heavy load or putting your truck through its paces on the race track. We stand behind every transmission we build because we test what we sell.

Backed by Innovation and Experience

Years of research and development have gone into the Stage 3 Allison transmission to bring you unmatched performance and durability. When you choose Randy’s, you’re choosing a product that has been fine-tuned through countless hours of testing, ensuring you get the best possible transmission for your Duramax.

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.