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USD 2968.75 2968.75 2968.75
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ATS Built Allison LCT1000 5-Speed Transmission

2001-2005 GM 6.6L Duramax LB7/LLY
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Maximize dependability and get power to the ground in your 2001-2005 GM 6.6L Duramax with the ATS Built LCT1000 5-Speed Transmission. Innovation and technology set ATS apart from the rest. Between the engineering team, and their transmission specialists, ATS has logged thousands of hours in building, testing, and manufacturing to bring you the best Allison Transmission for your truck.

ATS manufactures every clutch used in their transmissions and torque converters. Using their 3-axis high-intensity CNC laser to cut out their clutch steels, ATS is one of the only manufacturers in the industry with these capabilities. This not only ensures the highest quality, but it also gives ATS the ability to modify and improve over the factory components, without having to just buy whatever clutches are already available on the market. ATS Clutch Designs provide the ability to add over 200% torque capacity to the transmission allowing for more power, and heavier loads without compromising reliability. In addition, ATS has formulated their own unique clutch material that is ONLY used in ATS transmissions. It also uses a bonding agent that will not disintegrate with heat or water, once it has bonded with the steel, they essentially become one piece. All clutch material is also bonded in house, which means unparalleled quality control over the parts that YOU rely on to get you to work, down the race track, or through a family vacation.  

Valve Body
The valve body is essentially the brain of your transmission, it’s what routes the fluid to the clutch pack based on which gear it needs to be in. Naturally, this important component was also in need of improvement. A stock transmission will run with line pressures around 90psi. While this is no problem for stock power, it has little room for added torque. With the ATS Shift Kit and the Pump Upgrade Kit, ATS increases pressure up to 250psi. This gives you higher clamping force and provides added torque capacity.  

Add in the optional ATS Co-Pilot and you can reach up to 300psi. Not only does this allow the transmission to hold more power, it allows for quick, crisp shifts with little to no delay in shift timing. So not only do you get through the gears quicker, you will not lose boost or RPM. 

  • ATS Built Transmission 
  • Modified Transmission Pump 
  • Modified A&B Trim Valves 
  • New Gaskets & Seals 

Build Date Guide:
2001-2002 Transmission LB7 Engine: Trucks built from Aug-2000 to Jul-2002
2003-2004 Transmission LB7 Engine: Trucks built from Aug-2002 to Dec-2003
2004.5-2005 Transmission LLY Engine: Trucks built from Feb-2004 to Jul-2005

Note: Transmission ONLY. Deep Pan, Torque Converter and CoPilot must be added (sold separately).

Warranty Information: 
This ATS Automatic Transmission carries a ONE YEAR/ONE HUNDRED THOUSAND MILE (1 yr/100,000 mile) Warranty. This Warranty shall not apply to any automatic transmission that has been improperly stored or installed This Warranty shall not apply to misapplication, improper operating conditions, accidents, or neglect. This Warranty shall not apply to an automatic transmission that has been improperly repaired, maintained and/or altered by the owner or his agent/tech. Most importantly, all transmission shafts are not covered by this Warranty on any transmission due to the capability of certain situations to cause stress-loads beyond the structural ability of the shaft. ATS’ Automatic Transmission Warranty is NOT transferable. It is mandatory for implementation of this warranty that line pressures are tested at time of install. ATS will not pay for any fluids replaced in the event of a transmission failure.

Product Options

3069214248 01-02 LB7 (2WD)
3069414248 01-02 LB7 (4WD)
3069214272 03-04 LB7 (2WD)
3069414272 03-04 LB7 (4WD)
3069214290 04.5-05 LLY (2WD)
3069414290 04.5-05 LLY (4WD)


  • Manufacturer Name ATS Diesel
  • Shipping Weight 500.00 lb.
  • Fuel Type Diesel
  • Warranty Yes
  • Warranty Info 1 Year / 100,000 Miles
    View Warranty Form
  • Prop 65 WARNING: Cancer & Reproductive Harm -


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Questions and Answers

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Most Popular Questions

Does this kit come complete transmission with or without torque coverter?
View Staff Answer 
Transmission ONLY. Deep Pan, Torque Converter and CoPilot must be added (sold separately).
Is the co pilot necessary with this transmission?
View Staff Answer 

No, the ATS Co-Pilot Transmission Controller is not required, but will add additional holding power on the transmission as well as an overall more efficient power transfer.

What's the horsepower rating for this transmission?
View Staff Answer 

This ATS Built LCT1000 5-Speed Transmission is sold as the transmission ONLY. The transmission will easily hold 500+ hp.

Deep Pan, Torque Converter and CoPilot must be added (sold separately). The Co-Pilot is designed for trucks at any power level, but becomes crucial at 600+ hp at the tires.

The addition of the ATS CoPilot, ATS Billet Flex Plate, ATS Billet Input Shaft, ATS Billet Output Shaft (4WD Only) could easily push the transmission over 1000 hp.

Does it include flex plate
View Staff Answer 
The ATS LCT1000 includes just the transmission. Everything else is sold separately.
XDP continues to closely monitor the COVID-19 (Coronavirus) outbreak. As an integral part of the automotive supply chain, at this point all call centers and distribution centers remain fully operational to ensure we keep vital service components flowing to vehicles used in transport of goods and emergency response. To ensure the health of our employees, families, and customers, we have made the following procedural changes:

  • UPDATE: Effective 6/1 Customer Service resumes normal business hours of M-F 8:30 – 9:00pm EST.
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The circumstances of this virus are fast moving, as such, we will continue to update you with any further operational adjustments as needed. As always, we value your business and appreciate your patience as we manage this situation together.