Product Description
The ATS 309-842-4308 Stage 4 Allison LCT1000 Transmission Package is a high-performance upgrade designed for 2006–2007 6.6L LLY, LBZ, and LMM Duramax trucks. Built to handle significantly increased power levels over stock, this 2WD transmission package delivers enhanced durability, improved shift quality, and dependable performance for towing, street, and moderate competition use.
Engineered with upgraded clutch packs, reinforced internal components, and precision calibration, the Stage 4 transmission eliminates common factory weaknesses while maintaining excellent drivability. Paired with the ATS Five Star torque converter and deep transmission pan, this package ensures optimal power transfer and improved thermal management under load.
This is a complete performance transmission solution ideal for trucks running higher horsepower tunes, offering increased torque capacity and long-term reliability without sacrificing everyday usability.
FAQ
Q: What is the difference between Stage 4 and Stage 5?
A: Stage 4 is designed for high-performance street and towing applications, while Stage 5 is built for extreme horsepower and competition use with additional billet components.
Q: Is this transmission suitable for towing?
A: Yes, the Stage 4 package is ideal for heavy towing with improved clutch capacity and cooling performance.
Q: Does this include a torque converter?
A: Yes, it includes the ATS Five Star torque converter for increased efficiency and torque multiplication.
Q: What horsepower levels can this handle?
A: This transmission is typically suited for builds up to approximately 700–800 horsepower depending on setup.
Fitment
- 2006 Chevrolet Silverado 2500HD/3500HD 6.6L LLY / LBZ Duramax (2WD)
- 2006 GMC Sierra 2500HD/3500HD 6.6L LLY / LBZ Duramax (2WD)
- 2007 Chevrolet Silverado 2500HD/3500HD 6.6L LBZ / LMM Duramax (2WD)
- 2007 GMC Sierra 2500HD/3500HD 6.6L LBZ / LMM Duramax (2WD)
Key Features
- Designed for high-performance street and towing applications
- Handles increased horsepower builds (up to ~800HP)
- Upgraded clutch packs and internal components
- ATS Five Star torque converter included
- Deep transmission pan for improved cooling
- Improved shift quality and transmission longevity
- Optimized for reliability under load
Specifications for ATS 309-842-4308
| Specification | Details |
|---|---|
| Part Number | 309-842-4308 |
| UPC | Not Available |
| GTIN | Not Available |
| Transmission Type | Allison LCT1000 Stage 4 |
| Drivetrain | 2WD |
| Engine Compatibility | 6.6L Duramax LLY / LBZ / LMM |
| Model Years | 2006 - 2007 |
| Horsepower Rating | Up to 800 HP |
| Torque Capacity | Significantly 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 |
