Tier One's Stage 2 Allison 1000 Transmission Features:
- Built Allison 1000 transmission than can handle big-time power, heavy towing, off-roading, sled pulls, and racing
- Handles up to 900 horsepower from aggressive Duramax tuning, bigger turbos, oversized injectors, and exhaust upgrades
- Complete, drop-in transmission for 2001-2003 GM 2500 & 3500 6.6L Duramax LB7 trucks
- Includes a billet triple-disc torque converter, billet input 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 notch, and new filter
- Fixes common Allison transmission issues while allowing you to turn up your Duramax's power and torque levels
- Perfect for aggressive Duramax sled pull builds, light drag race rigs, aggressive off-road machines, and heavy towing applications
- 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 slightly firmer than stock
Built Allison 1000 that's perfect for Performance Duramax builds, Sled Pulls, Drag Racing, and Extremely Heavy Towing
If you're putting together one of the toughest Duramax trucks on your block, you're going to need an Allison 1000 transmission that can handle serious levels of horsepower and torque. The Tier One Stage 2 Allison 1000 Transmission for 2001-2003 Silverado or Sierra HD Duramax 6.6L LB7 trucks can hold huge levels of power, which lets you stack powerful larger turbos, oversized injectors, exhaust upgrades, and powerful Duramax tunes onto your awesome truck without needing to worry about your Allison transmission letting you down. Each Tier One Stage 2 Allison transmission can hold up to 900 horsepower and are right at home doing tough work and having rough fun both on and off the pavement. The Stage 2 Allison Transmission can handle itself on the street, out in the wilderness, down at the sled pull, out at the drag strip, or over at your local dyno day. The Tier One Stage 2 Allison is a great choice for anyone looking to take their LB7 Duramax to the next level of power and performance, and to have a ton of fun while you're at it.
Comes with a Billet Triple-Disc Torque Converter, Billet Input Shaft, Billet C2 Hub, High-Pressure Valve Body, RatioTek Valve Body Kit, Performance Overhaul Kit with increased clutch count, Deep Transmission Pan, New Solenoids, New Internal Wiring Harness, New Switch Manifold, Billet PTO Cover, and new Filter
Each Tier One Stage 2 Allison 1000 Transmission comes with a whole host of upgraded components that let the transmission handle a ton of power and hard use. The Stage 2 Allison transmission starts with a billet triple-disc torque converter that's far more resistant to warping and burn-up than the factory converter. The converter mates with a TCS billet input shaft made from 9310 Vacumelt steel that's far more resistant to cracking and shearing than the factory cast input shaft. Tier One includes a TCS billet C2 clutch hub that can handle much higher loads than stock, and Tier One properly machines the P1 sun gear for fitment of the TCS hub. Each Stage 2 Allison transmission comes with a high-pressure valve body fitted with a RatioTek valve body kit which can handle high line pressures while both properly feeding the transmission fluid and getting firm, but accurate and fast shifts. Tier One outfits each Stage 2 transmission with a Performance Rebuild Kit that includes additional clutches for the C1, C2, C3, and C4 clutch packs to ensure proper clamping force and power-holding when under extreme load. Tier One also includes a cast aluminum, deep transmission pan with increased fluid capacity for improved cooling during hard operation. To help improve long-term reliability, Tier One installs a new OEM internal wiring harness, new OEM PCS solenoids, new OEM switch manifold, and new filter. The Stage 2 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 Stage 2 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 careful inspection and vacuum-testing. 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: up to 900 horsepower
- Torque Converter: Billet triple-disc
- Input Shaft: Billet Steel
- Intermediate Shaft: OEM
- Output Shaft: OEM
- 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 & C3 Oiler Upgrade
For 2001-2003 GM Duramax LB7 2500 & 3500 Only: this transmission will only fit 2001-2003 GM 2500 & 3500 6.6L Duramax LB7 trucks that came with Allison 1000 transmissions from the factory. A
2004-2005 Duramax LLY Stage 2 Allison Transmission,
2006-2007 Duramax LBZ Stage 3 Allison Transmission,
2008-2010 Duramax LMM Stage 2 Allison Transmission,
2011-2016 Duramax LML Stage 2 Allison Transmission, and
2017-2019 Duramax L5P Stage 2 Allison Transmission are also available. If you have an older Silverado or Sierra HD, please see all of our
Allison transmissions. For other GM truck transmission builds, call us directly at 602-399-5484.
Backed by a 2-Year, Unlimited Mileage Warranty: each of our Allison 1000 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. For more information and/or instructions for sending in a core, call 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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