Product Description
The ATS 309-812-4440 Stage 1 Allison LCT1000 Transmission Package is the perfect upgrade for 2017–2019 6.6L L5P Duramax trucks looking for improved durability and reliability over the factory transmission. Designed as a performance-enhanced stock replacement, this 2WD transmission package addresses common factory weaknesses while maintaining smooth drivability for daily use and towing.
ATS upgrades critical internal components to increase clutch holding capacity, improve oil flow, and enhance overall transmission longevity. This makes it an ideal solution for lightly modified trucks, towing applications, and drivers who want added confidence without stepping into higher-stage race builds.
Paired with the ATS Five Star torque converter, this package delivers improved power transfer, reduced slippage, and better efficiency under load. Whether you're hauling, daily driving, or running mild tuning, this Stage 1 package provides dependable performance and extended transmission life.
FAQ
Q: Who is the ATS Stage 1 transmission designed for?
A: It is designed for stock to mildly modified trucks that need improved reliability and performance over the factory transmission.
Q: Is this good for towing?
A: Yes, this transmission is ideal for towing applications, offering improved clutch capacity and reduced heat buildup.
Q: Does this include a torque converter?
A: Yes, it includes the ATS Five Star torque converter for better efficiency and durability.
Q: Can this handle tuned trucks?
A: Yes, it can handle mild tuning, but higher horsepower builds should consider Stage 2 or higher packages.
Fitment
- 2017 Chevrolet Silverado 2500HD/3500HD 6.6L L5P Duramax (2WD)
- 2018 Chevrolet Silverado 2500HD/3500HD 6.6L L5P Duramax (2WD)
- 2019 Chevrolet Silverado 2500HD/3500HD 6.6L L5P Duramax (2WD)
- 2017 GMC Sierra 2500HD/3500HD 6.6L L5P Duramax (2WD)
- 2018 GMC Sierra 2500HD/3500HD 6.6L L5P Duramax (2WD)
- 2019 GMC Sierra 2500HD/3500HD 6.6L L5P Duramax (2WD)
Key Features
- Performance-built stock replacement transmission
- Increased clutch capacity over factory
- Improved oil flow and internal durability
- ATS Five Star torque converter included
- Smooth shifting with enhanced holding power
- Designed for towing and daily driving
- Ideal for stock and mildly tuned trucks
Specifications for ATS 309-812-4440
| Specification | Details |
|---|---|
| Part Number | 309-812-4440 |
| UPC | Not Available |
| GTIN | Not Available |
| Transmission Type | Allison LCT1000 Stage 1 |
| Drivetrain | 2WD |
| Engine Compatibility | 6.6L Duramax L5P |
| Model Years | 2017 - 2019 |
| Horsepower Rating | Up to ~500 HP (Recommended) |
| Torque Capacity | Increased over stock |
| Shipping Weight | Approximately 400 lbs |
| Shipping Method | Freight (Core Charge Applies) |
| Warranty | 5 Year / 500,000 Mile Limited Warranty |
| California Prop 65 | WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov |
