Tier One's Competition Allison 1000 Transmission Features:
- Fully built Allison 1000 Transmission that's made for competition use
- Handles over 1000 horsepower from compound turbos, massive injectors, nitrous injection, exhaust upgrades, and full bolt-ons
- Complete, drop-in transmission for 2001-2003 GM 2500 & 3500 6.6L Duramax LB7 trucks
- Includes billet triple-disc torque converter, billet input shaft, billet intermediate shaft, billet output shaft, billet C2 clutch hub, high-pressure valve body, RatioTek valve body kit, performance overhaul kit with additional clutches, deep transmission pan, new PCS solenoids, new internal wiring harness, new switch manifold, billet PTO cover with C3 oiler upgrade, and new filter
- Fixes common Allison 1000 problems while letting you hit massive power and crush your competition at the drag strip or dyno day
- Perfect for dedicated drag race Duramax builds, big number dyno trucks, extremely aggressive sled pull rigs, or other competition use
- Black finish for a great look under your truck
- Valve bodies are both leak-checked and dyno-tested prior to install
- Comes backed by a 2-year, unlimited mileage warranty
- Requires additional core charge and freight shipping
- If you have questions or want a custom Allison 1000 build, contact Tier One or call 602-399-5484!
- Shifting will be much firmer than stock
Completely Built Allison 1000 Transmission that's built for Competitive Drag Racing or Dyno Day Use
If you're putting together an LB7 Duramax build that has enough power to absolutely smash your competition at the drag strip or up on the dyno, you're going to need a transmission that can handle absolutely ridiculous levels of power and torque. The Tier One Competition Allison 1000 Transmission can hold over 1000 horsepower, which lets you stack huge compound turbos, massive fuel injectors, high-shot nitrous systems exhaust upgrades, and powerful Duramax custom tuning onto your 6.6L LB7 Duramax diesel without your transmission letting you down while you crush your opponents. The Tier One Competition Allison Transmission was designed specifically for competition use, and is right at home on powerful Duramax drag racing and dyno day builds that are throwing down massive amounts of power. Each Competition Allison Transmission is a drop-in replacement for the factory Allison 1000 transmission, and features overhauled components that can handle and put down all the power your LB7 Duramax can manage to spit out.
Includes High-Strength Billet Internal Transmission Components and New OEM Hardware for Awesome Power-Holding and Reliability
Each Tier One Competition Allison 1000 transmission comes with extremely strong internal and external transmission parts that will let your awesome Duramax hit insane levels of power and torque. Every Tier One Competition Allison 1000 Transmission starts off with a billet triple-disc torque converter that's far more resistant to burn-up and warping than stock, while also being able to handle far higher levels of power. The converter mates to a TCS billet steel input shaft that's far more resistant to cracking and shearing than the stock shaft. The Competition Allison transmission is also fitted with both a billet steel intermediate shaft and billet steel output shaft that handle the massive rotational forces and load from high-powered Duramax builds far better than stock. The Competition Allison 1000 Transmission comes standard with a billet steel C2 clutch hub that can handle the high levels of load from drag racing and dyno pulls, and Tier One does the necessary machining on the P1 sun gear in order for the billet hub to fit. Each Competition transmission has a high-pressure valve body with a RatioTek valve body kit which work together to keep the transmission's internal components supplied with fluid, while also firming up shifting for competition use. In order to help hold a ton of power, Tier One includes a performance overhaul kit that includes additional C1, C2, C3, and C4 clutches with improved friction material over stock. Tier One includes a deep, cast aluminum transmission pan with every competition transmission to reduce running temperatures and improve reliability. Each transmission comes with new OEM hardware to help ensure excellent reliability, including new OEM PCS solenoids, a new internal wiring harness, new OEM switch manifold, and a new filter. The Competition Allison 1000 transmission is topped off with a billet PTO cover with "Tier One" lettering and C3 oiler upgrade for improved transmission lubrication. The transmission receives new gaskets and seals before being air-checked for potential leaks.
Fully Overhauled Allison 1000 Transmission for Excellent Reliability
During our build of your Allison Competition transmission, we here at Tier One go over every millimeter of its internal components to guarantee excellent function and reliability. All parts are disassembled and cleaned from our OEM cores to ensure your new Allison 1000 transmission is free from contaminants and other debris. We carefully inspect your transmission’s planetary gear train for damage before fully speccing all bearings and washers for endplay. The valve body is and its solenoids are thoroughly inspected for better than OEM function. The performance rebuild kit includes new clutches, seals, gaskets, and sealing rings to replace all the wearable parts of the transmission before it’s installed on your Silverado or Sierra 2500 or 3500.
Thorough Testing of the Valve Body and Entire Transmission Before Shipping
We here at Tier One take pride in every built Allison 1000 transmission we manufacture for the GM 6.6L LB7 Duramax trucks. To make sure that you get a transmission that’s as tough as your truck, Tier One puts both the valve bodies and the entire assembled transmission through rigorous testing to ensure you get the reliability you need for heavy towing and hauling applications with your 6.6L Duramax diesel. Before the assembly of the valve body, it goes through a thorough inspection. All valve body solenoids are carefully tested to ensure flawless operation. After assembly of the valve body, it goes through rigorous dyno-testing to ensure proper fluid flow, line pressures, and solenoid operation. After final assembly of the transmission itself, we put it through a complete air-check to find potential leaks.
Specifications:
- Vehicle Fitment: 2001-2003 GM Silverado or Sierra 2500 or 3500 with 6.6L Duramax LB7
- Transmission Type: Allison 1000
- Power Rating: Over 1000 horsepower
- Torque Converter: Billet triple-disc
- Input Shaft: Billet Steel
- Intermediate Shaft: Billet Steel
- Output Shaft: Billet Steel
- Valve Body: High Pressure
- Valve Body Kit: RatioTek
- Clutch Hub: Billet Steel
- Clutches: SPZ/Raybestos, increased C1, C2, C3, and C4 clutch count
- Transmission Pan: Deep pan with more capacity
- Geartrain: OEM/Machined P1 Sun Gear
- PTO Cover: Billet Aluminum with "Tier One" lettering and C3 oiler upgrade
For 2001-2003 GM Duramax LLY 2500 & 3500 Only: this transmission will only fit 2001-2003 GM 2500 & 3500 6.6L Duramax LLY trucks that came with Allison 1000 transmissions from the factory. A
2004-2005 Duramax LLY Competition Allison Transmission,
2006-2007 Duramax LBZ Competition Allison Transmission,
2008-2010 Duramax LMM Competition Allison Transmission,
2011-2016 Duramax LML Competition Allison Transmission, and
2017-2019 Duramax L5P Competition Allison Transmission are also available. If you have an older Silverado or Sierra HD, please see all of our
Allison transmissions. If you have a 2007-2010 2500 or 3500 with a 6L90E transmission, please see our
6L90E built transmissions.
Backed by a 2-Year, Unlimited Mileage Warranty: each of our AS69RC HD Tow transmissions comes backed by a 2-year, unlimited mileage warranty. See our
warranty terms and conditions for more details.
Recommended gearing: the following gearing is recommended for the following tire sizes, and is required for Tier One to honor your warranty:
- 35" Tire: 3.73 gears or higher
- 37" Tire: 4.10 gears or higher
- +38" Tire: 4.56 gears or higher
Transmission Break-in: in order to maintain your warranty, this transmission requires a 300-mile break-in and a 100-mile relearn. Please check out
Tier One's Break-In Procedure & Policy here.
Core charge: this transmission includes a $2000.00 core charge that will be refunded upon receipt of your stock transmission. Tier One can also defer your core charge if you create an account our site and save your credit/debit card information. Your card will only be charged if your core is not returned or if there's damage to your core's critical components. For more information on our deferred core charge program, check out our
Deferred Core Terms and Conditions. If you you select "deferred core" from our drop-down, but fail to create an account and save your credit card information, you will be charged a $5.99 deferred core fee. For information on sending in your stock core or any other questions you may have, please give us a call directly at 602-399-5484!
Freight Shipping: this transmission ships via freight. Please carefully inspect your transmission before signing your Bill of Lading. If your transmission arrives damaged, please call us directly at 602-399-5484.
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