Product Description
Extreme Duty Allison Performance with ATS Stage 4 Power
The ATS 309-998-4308 LCT1000 6-Speed Stage 4 Transmission Package is engineered for maximum strength, durability, and performance in 2006–2007 GM 8.1L gas 2WD trucks. Built on the proven Allison LCT1000 platform, this Stage 4 package is designed to handle extreme towing, heavy loads, and high horsepower applications.
ATS takes the factory Allison transmission to the next level by upgrading critical internal components, increasing clutch capacity, and improving hydraulic control. The result is a transmission capable of handling significantly more torque while delivering firm, consistent shifts under load.
Whether you're hauling heavy, pushing power limits, or demanding long-term reliability, this ATS Stage 4 transmission package delivers unmatched performance and confidence.
Key Features:
- Complete Stage 4 performance transmission package
- Built Allison LCT1000 6-speed transmission
- Increased clutch capacity for higher torque handling
- Upgraded internal components for extreme durability
- Improved shift quality and transmission control
- Designed for heavy towing and high-performance applications
- ATS performance engineering and reliability
FAQ
What is a Stage 4 transmission?
A Stage 4 transmission is a fully built unit designed for high horsepower and heavy-duty use, with upgraded internals and increased holding capacity.
Is this a complete transmission?
Yes, this is a complete replacement transmission package, not a rebuild kit.
Is this suitable for towing?
Absolutely. This transmission is designed for extreme towing and heavy load applications.
Does this require a core return?
Yes, most ATS complete transmissions require a refundable core charge.
Fitment:
- 2006–2007 Chevrolet Silverado 2500HD / 3500 2WD
- 2006–2007 GMC Sierra 2500HD / 3500 2WD
- 8.1L Gas Engine
- Allison LCT1000 6-Speed Automatic Transmission
Note: This unit is for 2WD applications only. Always verify fitment before purchase.
Specifications for ATS 309-998-4308
| ATS 309-998-4308 Product Specifications | |
|---|---|
| Part Number | 309-998-4308 |
| Brand | ATS Diesel Performance |
| Product Type | Complete Stage 4 Transmission Package |
| Transmission Compatibility | Allison LCT1000 6-Speed |
| Engine Compatibility | 8.1L GM Gas Engine |
| Vehicle Fitment | 2006–2007 Silverado / Sierra 2500HD / 3500 (2WD) |
| UPC | N/A |
| GTIN | N/A |
| Shipping Weight | Approx. 325 lbs |
| Shipping Dimensions | Freight Shipping Required |
| Core Charge | Yes, refundable core charge applies |
| California Prop 65 | WARNING: Cancer & Reproductive Harm - www.P65Warnings.ca.gov |
