Product Description
The ATS 309-835-4290 Stage 3 Allison LCT1000 Transmission Package is a premium performance upgrade designed for 2004.5–2005 6.6L LLY Duramax trucks equipped with 4WD and PTO functionality. Built to handle increased power levels while maintaining reliability, this transmission package eliminates common factory weaknesses and delivers improved torque capacity, smoother shifting, and long-term durability.
Engineered with upgraded clutch packs, reinforced internal components, and the proven ATS Five Star torque converter, this Stage 3 transmission is ideal for towing, daily driving, and moderate performance builds. The inclusion of PTO capability makes it perfect for work trucks requiring auxiliary power systems without sacrificing performance.
This complete package provides a significant increase in holding power over stock while maintaining excellent drivability, making it the perfect balance between performance and dependability.
FAQ
Q: What power levels can the Stage 3 transmission support?
A: The ATS Stage 3 transmission is designed for moderate to high horsepower builds, typically supporting up to approximately 600–700HP depending on setup.
Q: Does this transmission support PTO functionality?
A: Yes, this unit is specifically built with PTO compatibility for work truck applications requiring auxiliary equipment operation.
Q: Is this transmission suitable for towing?
A: Absolutely. It is designed to handle heavy towing with improved clutch capacity and heat management over stock units.
Q: Does it include a torque converter?
A: Yes, it includes the ATS Five Star torque converter for improved torque multiplication and efficiency.
Fitment
- 2004.5 Chevrolet Silverado 2500HD/3500HD 6.6L LLY Duramax (4WD)
- 2005 Chevrolet Silverado 2500HD/3500HD 6.6L LLY Duramax (4WD)
- 2004.5 GMC Sierra 2500HD/3500HD 6.6L LLY Duramax (4WD)
- 2005 GMC Sierra 2500HD/3500HD 6.6L LLY Duramax (4WD)
Key Features
- Supports up to approximately 600–700HP
- Increased torque capacity over stock
- Upgraded clutch packs and internal components
- ATS Five Star torque converter included
- PTO (Power Take-Off) compatible
- Designed for towing, work trucks, and performance use
- Improved shift quality and durability
Specifications for ATS 309-835-4290
| Specification | Details |
|---|---|
| Part Number | 309-835-4290 |
| UPC | Not Available |
| GTIN | Not Available |
| Transmission Type | Allison LCT1000 Stage 3 |
| Drivetrain | 4WD |
| PTO Compatibility | Yes |
| Engine Compatibility | 6.6L Duramax LLY |
| Model Years | 2004.5 - 2005 |
| Horsepower Rating | Up to 700 HP |
| 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 |
