Allison 1000 Transmission Stage 4 900+ HP Max for 2001-2019 GM/CHEVY 2500/3500
Can I pick up my order or have it installed at your shop?
Can I pick up my order or have it installed at your shop?
Absolutely. We offer local pickup on most products and full professional installation at our shop in Washington, MO. Whether you just want to grab your parts or have our techs handle the install, we’ve got you covered. Give us a quick call at 636-429-7020 or message us to schedule a visit — we’ll make sure the parts are ready when you arrive.
How do I know if this part fits my vehicle?
How do I know if this part fits my vehicle?
Unsure if it’ll fit? No problem — that’s what we’re here for. Send us your vehicle’s year, make, and model, and we’ll verify fitment before you order. We can also point you toward compatible upgrades or supporting parts if needed.
What if I need to return a product or it’s defective?
What if I need to return a product or it’s defective?
Most unused items can be returned within 30 days in their original packaging. Some products are covered by a manufacturer’s warranty as well. If something arrives damaged or doesn’t meet your expectations, just let us know — we’ll help you get it replaced, refunded, or repaired. (Tracking updates are also emailed automatically once your order ships.)
What's the lead time on custom or fabricated parts?
What's the lead time on custom or fabricated parts?
Many of our parts are built to order — especially fabricated or performance components. These can take additional time to produce before shipping. Lead times vary by manufacturer and demand, but we’ll always keep you updated along the way. If you’re working on a tight schedule, reach out before ordering at 636-429-7020 and we’ll confirm current availability or estimated ship dates.
Description
Description
- 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 WarrantyAt 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.
