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  1. Home
  2. GM Duramax
  3. 2004.5-2005 GM Duramax 6.6L LLY
  4. Transmission Upgrades
  5. Modules

2004.5-2005 GM Duramax 6.6L LLY Transmission Modules

It's an unfortunate fact that your 2004.5-2005 GM 6.6L Duramax LLY's transmission will have trouble calculating the right time and place to change gears after upgrading and modifying your engine, resulting in rough and unreliable transmission shifting. In order to prevent this from happening, pick up any of these premium transmission control modules to send the proper OBD II codes to your Sierra/Silverado's computer for consistent gear shifting in every situation. Aside from it's vital link between your transmission and engine, these modules are designed to alert you if it happens to detect any malfunctions or other carious issues associated with your GM 2500/3500's transmission. This helps prevent serious damage to the trans and potential time-intensive repairs in your future. GM Duramax Fitments: 2004, 2005 GM 6.6L Duramax. Submodel Fitments: WT, Custom, LT, LTZ, High Country, 1LT, 2LT, Pro, SLE, SLT, AT4, Denali. Some exceptions apply, please see individual product pages for specific fitments.

GM Duramax>2004.5-2005 6.6L LLY

Products [9]

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Item In Cart ATS 6019044248 Allison 5-Speed Conversion Co-Pilot Transmission Controller
ATS 6019044248 Allison 5-Speed Conversion Co-Pilot Transmission Controller
- Ships from Manufacturer in 1-2 Business Days
$1,175.00
View Details
Item In Cart ATS 6019044308 Allison 6-Speed Conversion Co-Pilot Transmission Controller
ATS 6019044308 Allison 6-Speed Conversion Co-Pilot Transmission Controller
- Ships from Manufacturer in 1-2 Business Days
$1,175.00
View Details
Item In Cart 03-05 GM 2500/3500HD 6.6L Duramax BD Allison Tap Shifter Kit
03-05 GM 2500/3500HD 6.6L Duramax BD Allison Tap Shifter Kit
- Ships from Manufacturer in 1-2 Business Days
$431.95
View Details
Item In Cart Fleece FPE-ALILKR AlliLocker Allison Torque Converter Controller | 01-16 GM 6.6L Duramax 2500HD / 3500HD
Fleece FPE-ALILKR AlliLocker Allison Torque Converter Controller | 01-16 GM 6.6L Duramax 2500HD / 3500HD
In Stock. Ships in 1 Business Day!
$179.00
View Details
Item In Cart Merchant 29541852 Allison Nsbu Switch | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD
Merchant 29541852 Allison Nsbu Switch | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD
- Ships in 3-5 Business Days
$115.00
View Details
Item In Cart 06-10 GM 2500 / 3500HD 6.6L Duramax Suncoast Allison Valve Body
06-10 GM 2500 / 3500HD 6.6L Duramax Suncoast Allison Valve Body
- Ships in 3-5 Business Days
$1,055.00
View Details
Item In Cart ATS 6019244248 Allison Co-Pilot Transmission Controller | 01-05 GM 6.6L Duramax 2500HD / 3500HD
ATS 6019244248 Allison Co-Pilot Transmission Controller | 01-05 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 1-2 Business Days
$1,175.00
View Details
Item In Cart 01-05 GM 2500/3500HD 6.6L Duramax LB7 / LLY DuramaxTuner Allison Transmission 6 Speed Conversion Kit
01-05 GM 2500/3500HD 6.6L Duramax LB7 / LLY DuramaxTuner Allison Transmission 6 Speed Conversion Kit
- Ships in 3-5 Business Days
$1,875.00
View Details
Item In Cart 01-05 GM 2500 / 3500HD 6.6L Duramax Suncoast Allison Valve Body
01-05 GM 2500 / 3500HD 6.6L Duramax Suncoast Allison Valve Body
- Ships in 3-5 Business Days
$1,055.00
View Details
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  • Duramax
    • 2020-2022 Duramax L5P
      • Engine Upgrades
      • Exhaust Kits
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      • Exterior
      • View More
    • 2017-2019 Duramax L5P
      • Engine Upgrades
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    • 2011-2016 Duramax LML
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    • 2007.5-2010 Duramax LMM
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    • 2006-2007 Duramax LBZ
      • Engine Upgrades
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      • Exterior
      • View More
    • 2004.5-2005 Duramax LLY
      • Engine Upgrades
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      • View More
    • 2001-2004 Duramax LB7
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  • Powerstroke
    • 2020-2022 6.7L Powerstroke
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    • 2017-2019 6.7L Powerstroke
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    • 2011-2016 6.7L Powerstroke
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    • 2008-2010 6.4L Powerstroke
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