Product Description
The ATS 309-853-4308 Stage 5 Allison LCT1000 Transmission Package is a top-tier performance upgrade designed for 2006-2007 GM trucks equipped with the 6.6L Duramax diesel engine (LLY, LBZ, and early LMM) and 2WD configuration with PTO. Built for extreme power levels, heavy towing, and high-performance applications, this Stage 5 package represents ATS’s highest level of transmission engineering for the Allison platform.
This complete package includes a fully built ATS Allison LCT1000 transmission featuring billet internal components, upgraded clutch packs, and precision-calibrated valve body modifications. It is paired with an ATS Five Star torque converter designed for maximum torque multiplication, reduced slippage, and improved throttle response under load.
Engineered to handle significantly increased horsepower and torque, the Stage 5 package addresses known factory limitations by reinforcing critical internal components and improving hydraulic control. The result is firmer, more consistent shifts, improved durability, and long-term reliability in even the most demanding diesel applications.
Whether you are towing heavy loads, running performance tuning, or building a high-horsepower Duramax, the ATS Stage 5 Allison package delivers unmatched strength and confidence on the road or at the track.
FAQ
What is included in the ATS 309-853-4308 package?
This package includes a fully built ATS Stage 5 Allison LCT1000 transmission and an ATS Five Star torque converter.
What makes Stage 5 different from lower stages?
Stage 5 includes upgraded billet internal components, higher capacity clutch packs, and enhanced hydraulic control for maximum torque handling and durability.
Is this transmission suitable for high horsepower builds?
Yes. This package is specifically designed for high-performance and high-horsepower applications.
Does this transmission support PTO?
Yes. This unit is built for 2WD trucks equipped with PTO functionality.
Will this fit my Duramax truck?
This package fits 2006-2007 GM trucks with 6.6L LLY, LBZ, and early LMM Duramax engines and Allison transmissions.
FITMENT
2006-2007 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LLY / LBZ / LMM (2WD with PTO)
2006-2007 GMC Sierra 2500HD / 3500HD 6.6L Duramax LLY / LBZ / LMM (2WD with PTO)
Specifications for ATS 309-853-4308
| Specification | Details |
|---|---|
| Part Number | 309-853-4308 |
| Product Name | ATS Stage 5 Allison LCT1000 Transmission Package |
| Transmission Model | Allison LCT1000 Automatic |
| Engine Fitment | 6.6L Duramax LLY / LBZ / LMM |
| Vehicle Fitment | 2006-2007 Chevy Silverado / GMC Sierra 2500HD / 3500HD |
| Drive Configuration | 2WD |
| PTO Compatibility | Yes |
| Included Components | Stage 5 Built Transmission, Five Star Torque Converter |
| Performance Level | Stage 5 - Extreme Duty / High Horsepower |
| Material | Billet Internal Components with Upgraded Clutch Packs |
| Application Notes | Designed for high horsepower builds, towing, and performance applications |
| UPC | Not Available |
| GTIN | Not Available |
| Shipping Information | Freight Shipping Required |
| Core Charge | Core Charge Applies |
| Prop 65 | WARNING: Cancer and Reproductive Harm |
