Currently Unavailable
Due to shortages of cores and other components causing excessive lead times, this transmission is not currently available for purchase. We hope to have them available again in the near future.
Tier One's HD Towing 10L1000 Transmission Features:
- Designed to handle heavy towing more reliably than stock
- Includes new OEM and improved aftermarket components to fix common issues
- Complete drop-in transmission transmission for 2020-2024 2500 & 3500 Duramax trucks
- Includes a billet triple-disc torque converter, an overhaul kit with performance clutches, Sonnax solenoid clips and inserts, improved OEM CDF drum, new OEM F clutch drum, and deep cast aluminum transmission pan
- Fixes common Allison 10L1000 problems while improving reliability at stock or near-stock power levels
- Black finish for a great look under your truck
- Backed by a 2-year/unlimited mileage warranty
- Requires an additional core charge and freight shipping
- If you have questions or want a custom 10L1000 build, contact Tier One or call 602-399-5484
Built 10L1000 Transmission with Improved Reliability when Towing Heavy at Near-Stock Power
Even though the Allison transmissions are touted as THE transmission for heavy towing, but even the mighty 10L1000s can suffer from some issues if you're towing and hauling big loads on a regular basis, even at factory power levels. Tier One's HD Tow Allison 10L1000 was purpose-designed to give your 2020-2024 Duramax Silverado or Sierra 2500 and 3500 the reliability and shifting performance it needs to handle practically any towing application. The Tier One Allison 10L1000 towing transmission can handle pulling big trailers, huge fifth wheels, and massive toy haulers without letting you or your tough Duramax truck down. Each HD Tow 10L1000 transmission features a combination of updated OEM transmission components and new performance parts to give your truck a transmission that can handle towing and the daily grind with the reliability that your Silverado or Sierra truly deserves.
Includes a Billet Triple-Disc Torque Converter, a Complete Overhaul Kit with Performance Clutches, Sonnax Solenoid Clips & Inserts, Improved OEM CDF Drum, New OEM F-Clutch Drum, and Deep Cast Aluminum Transmission Pan
The Tier One HD Tow Transmission features just enough performance upgrades to improve reliability at stock or near-stock power levels, as well as improved OEM components that can help you avoid problems way down the road. The Tier One HD Tow 10L1000 transmission starts off with a billet triple-disc torque converter that's far more resistant to burn-up, cracking, and warping than stock while also offering 33% more apply area than stock. The HD Tow transmission includes a complete overhaul kit that comes standard with performance GPZ clutches that feature more aggressive friction material than OE-style clutches so that they're more resistant to wear, high-temperatures, and load than stock. To prevent solenoid misalignment and possible wear on the valve body, Tier One includes both a Sonnax solenoid stabilization clip and stabilization retainer that hold the valve body solenoids steady when under load and give you much more reliable transmission operation. To increase long-term reliability, we here at Tier one include the latest OEM GM CDF drum design, as well as a new OEM F-clutch drum, both of which can suffer gouging and failures when placed under big loads from towing and hauling. The 10L1000 HD Tow transmission is rounded out by a deep-style, cast aluminum transmission pan that has increased fluid capacity and cooling fins that work together to lower transmission operation temperatures. Tier One also installs new gaskets and seals before air-checking the transmission for leaks.
Fully Overhauled Ford 10L1000 Transmission for Excellent Reliability and Performance
During Tier One’s build of your 10L1000 Towing Transmission, we go over every inch of its internal components to guarantee you excellent functionality, great shifting, and awesome reliability. All parts and components are disassembled and cleaned from our OEM cores to ensure your new 10L1000 transmission is free from contaminants and other debris. We carefully inspect your transmission’s planetary geartrain for damage before fully speccing all your bearings and washers for endplay. The included rebuild kit includes new seals, gaskets, and sealing rings to replace all the wearable parts of the transmission before it’s installed on your Silverado or Sierra HD truck.
Thorough Testing of the Valve Body and Entire Transmission Before Shipping
We here at Tier One take pride in every built Allison 10L1000 transmission we manufacture for the GM 2500 & 3500 trucks. To make sure you get a built 10L1000 transmission that’s as tough as your truck, Tier One puts the valve bodies and entire assembled transmissions through rigorous testing to ensure you get the reliability you need for heavy towing and hauling applications with your Silverado or Sierra truck. All valve body solenoids are carefully tested to ensure flawless operation. After final assembly of the transmission itself, we put it through a complete air-check to find potential leaks before a final inspection and shipping out.
Tier One HD Tow Allison 10L1000 Transmission Specifications:
- Vehicle Fitment: 2020-2024 Silverado & Sierra 2500 & 3500
- Transmission Type: Allison 10L1000
- Power Rating: Stock or Near-Stock Power
- Torque Converter: Billet Triple-Disc
- Valve Body: OEM with Sonnax inserts & retainers
- Transmission Pump: OEM
- E Clutch Drum: OEM
- F Clutch Drum: OEM
- CDF Drum: Revised OEM
- Clutches: Performance GPZ Clutches
- Transmission Pan: Deep Cast Aluminum
Silverado & Sierra Fitment: this transmission will only fit 2020-2024 Silverado & Sierra trucks that came with Allison 10L1000 transmissions. This transmission cannot be used to replace a 6L90 transmission. You can find our built 6L90E transmissions here.
Requires Reprogramming & Relearn: installation of this transmission will require reprogramming at a certified GM service center, as well as a relearn period.
Backed by a 2-Year/Unlimited Mileage Warranty: each of our Allison 10L1000 Transmissions comes backed by a 2-year, unlimited 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
Core charge: this transmission includes a $2500.00 core charge that will be refunded once Tier One receives your stock transmission, inspects it, and finds it acceptable condition. The core charge can be fully or partially waived if you send in or drop off your stock transmission ahead of time.
Freight Shipping: this transmissions 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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