Product Description
The ATS 309-812-4308 Stage 1 Allison LCT1000 Transmission Package is the perfect upgrade for 2006–2007 6.6L Duramax LLY, LBZ, and LMM trucks looking for improved reliability and towing performance. Designed as a heavy-duty replacement for the factory transmission, this package addresses common failure points while maintaining smooth, factory-like drivability.
This Stage 1 transmission is ideal for daily drivers and work trucks that demand increased durability without sacrificing comfort. ATS enhances clutch capacity, improves internal components, and refines hydraulic performance to provide longer service life and more consistent shifting under load.
Whether you're towing, hauling, or simply want peace of mind, this transmission delivers dependable performance with upgraded strength over stock.
FAQ
Q: What is the purpose of a Stage 1 transmission?
A: Stage 1 is designed to improve reliability and durability over stock while maintaining smooth, stock-like shifting for daily driving and towing.
Q: Is this transmission good for towing?
A: Yes, it is built specifically for improved towing performance and long-term reliability under load.
Q: Does this transmission include a torque converter?
A: Yes, it includes an upgraded ATS torque converter designed for improved efficiency and durability.
Q: Is this suitable for high horsepower builds?
A: Stage 1 is best suited for stock to mildly modified trucks. Higher horsepower applications should consider Stage 3–5 packages.
Fitment
- 2006 Chevrolet Silverado 2500HD/3500HD 6.6L LLY Duramax (2WD)
- 2006 Chevrolet Silverado 2500HD/3500HD 6.6L LBZ Duramax (2WD)
- 2007 Chevrolet Silverado 2500HD/3500HD 6.6L LBZ Duramax (2WD)
- 2007 Chevrolet Silverado 2500HD/3500HD 6.6L LMM Duramax (2WD Classic Body)
- 2006 GMC Sierra 2500HD/3500HD 6.6L LLY Duramax (2WD)
- 2006 GMC Sierra 2500HD/3500HD 6.6L LBZ Duramax (2WD)
- 2007 GMC Sierra 2500HD/3500HD 6.6L LBZ Duramax (2WD)
- 2007 GMC Sierra 2500HD/3500HD 6.6L LMM Duramax (2WD Classic Body)
Key Features
- Improved clutch capacity over stock
- Upgraded internal components for durability
- Enhanced hydraulic performance
- ATS torque converter included
- Designed for towing and daily driving
- Smooth, factory-like shifting
- Increased reliability over OEM transmission
Specifications for ATS 309-812-4308
| Specification | Details |
|---|---|
| Part Number | 309-812-4308 |
| UPC | Not Available |
| GTIN | Not Available |
| Transmission Type | Allison LCT1000 Stage 1 |
| Drivetrain | 2WD |
| Engine Compatibility | 6.6L Duramax LLY / LBZ / LMM |
| Model Years | 2006 - 2007 |
| Horsepower Rating | Up to 450 HP (Recommended) |
| Torque Capacity | Improved 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 |
