Product Description
The ATS 309-812-4248 Stage 1 Allison LCT1000 Transmission Package is the ideal upgrade for 2001–2002 6.6L LB7 Duramax owners looking to improve reliability and performance over stock without going to extreme race-level builds. Designed as a heavy-duty replacement, this 2WD transmission package strengthens key internal components while maintaining smooth drivability for daily use and towing.
This Stage 1 transmission is perfect for mildly tuned trucks and work applications, offering improved clutch holding capacity, better heat management, and longer service life compared to factory units. It’s engineered to eliminate common OEM failure points while delivering consistent, dependable performance.
Whether you're towing, hauling, or running light performance upgrades, the ATS Stage 1 Allison provides the durability and confidence your Duramax needs.
FAQ
Q: What is the main benefit of the Stage 1 transmission?
A: It improves durability and reliability over stock while maintaining smooth factory-like shifting, making it ideal for daily driving and towing.
Q: Is this transmission good for towing?
A: Yes, it is designed specifically to handle towing loads better than stock with upgraded clutch capacity and improved cooling.
Q: Does this include a torque converter?
A: Yes, this package includes an upgraded ATS torque converter for improved performance and efficiency.
Q: What power levels can this handle?
A: Stage 1 is best suited for stock to mildly modified trucks, typically supporting moderate horsepower increases over factory levels.
Fitment
- 2001 Chevrolet Silverado 2500HD/3500HD 6.6L LB7 Duramax (2WD)
- 2001 GMC Sierra 2500HD/3500HD 6.6L LB7 Duramax (2WD)
- 2002 Chevrolet Silverado 2500HD/3500HD 6.6L LB7 Duramax (2WD)
- 2002 GMC Sierra 2500HD/3500HD 6.6L LB7 Duramax (2WD)
Key Features
- Upgraded clutch packs for increased holding capacity
- Improved valve body calibration for better shift quality
- Enhanced durability over stock transmission
- ATS upgraded torque converter included
- Designed for towing and daily driving
- Addresses common factory Allison weaknesses
Specifications for ATS 309-812-4248
| Specification | Details |
|---|---|
| Part Number | 309-812-4248 |
| UPC | Not Available |
| GTIN | Not Available |
| Transmission Type | Allison LCT1000 Stage 1 |
| Drivetrain | 2WD |
| Engine Compatibility | 6.6L Duramax LB7 |
| Model Years | 2001 - 2002 |
| Horsepower Rating | Stock to Mildly Modified Applications |
| 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 |
