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

2004.5-2005 GM Duramax 6.6L LLY Complete Transmissions

The factory transmission equipped on your 2004.5-2005 GM 6.6L Duramax LLY build becomes a weak point after you add increased levels of horsepower and torque to the engine. Instead of trying to piece together the best transmission upgrades for your particular setup, choose from our selection of complete transmissions for reliable and consistent performance under every circumstance. These complete transmissions for your GM 2500/3500 drop right into place of your Sierra/Silverado's stock components and will handle the huge levels of power your truck is throwing down. 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 [43]

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Item In Cart ATS 3099154290 Lct1000 5 Speed Stage 1 Package | 04.5-05 GM 2500/3500 HD 4WD
ATS 3099154290 Lct1000 5 Speed Stage 1 Package | 04.5-05 GM 2500/3500 HD 4WD
- Ships from Manufacturer in 3-4 Weeks
$4,800.95
View Details
Item In Cart ATS 3099234290 Lct1000 5 Speed Stage 2 Package | 04.5-05 GM 2500/3500HD 2WD
ATS 3099234290 Lct1000 5 Speed Stage 2 Package | 04.5-05 GM 2500/3500HD 2WD
- Ships from Manufacturer in 3-4 Weeks
$5,810.88
View Details
Item In Cart ATS 3099254290 Lct1000 5 Speed Stage 2 Package | 04.5-05 GM 2500/3500 HD 4WD
ATS 3099254290 Lct1000 5 Speed Stage 2 Package | 04.5-05 GM 2500/3500 HD 4WD
- Ships from Manufacturer in 3-4 Weeks
$5,810.88
View Details
Item In Cart ATS 3099334290 Lct1000 5 Speed Stage 3 Package | 04.5-05 GM 2500/3500HD 2WD
ATS 3099334290 Lct1000 5 Speed Stage 3 Package | 04.5-05 GM 2500/3500HD 2WD
- Ships from Manufacturer in 3-4 Weeks
$6,607.65
View Details
Item In Cart Deviant 71402 Stage 3 Competition Allison Transmission | 01-05 GM 6.6L Duramax 2500HD / 3500HD
Deviant 71402 Stage 3 Competition Allison Transmission | 01-05 GM 6.6L Duramax 2500HD / 3500HD
- Ships in 3-5 Business Days
$10,000.00 $9,000.00 Sale
View Details
Item In Cart DRP-71400
DRP-71400
- Ships in 3-5 Business Days
$5,000.00 $4,500.00 Sale
View Details
Item In Cart Deviant 71401 Stage 2 Race Allison Crate Transmission | 01-05 GM 6.6L Duramax 2500HD / 3500HD
Deviant 71401 Stage 2 Race Allison Crate Transmission | 01-05 GM 6.6L Duramax 2500HD / 3500HD
- Ships in 3-5 Business Days
$7,200.00 $6,480.00 Sale
View Details
Item In Cart Randys Transmissions 311241033 Stage 3 Allison 1000 Transmission 900HP Max | 01-17 GM 6.6L Duramax 2500HD / 3500HD
Randys Transmissions 311241033 Stage 3 Allison 1000 Transmission 900HP Max | 01-17 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 2-3 Weeks
$7,995.00
View Details
Item In Cart Randys Transmissions 311241035 Stage 4 Allison 1000 Transmission 900+HP Max | 01-17 GM 6.6L Duramax 2500HD / 3500HD
Randys Transmissions 311241035 Stage 4 Allison 1000 Transmission 900+HP Max | 01-17 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 2-3 Weeks
$9,995.00
View Details
Item In Cart Randys Transmissions 311241030 Stage 1 Allison 1000 Transmission | 01-17 GM 6.6L Duramax 2500HD / 3500HD
Randys Transmissions 311241030 Stage 1 Allison 1000 Transmission | 01-17 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 2-3 Weeks
$4,795.00
View Details
Item In Cart Randys Transmissions 311241031 Stage 2 Allison 1000 Transmission 700HP Max | 01-17 GM 6.6L Duramax 2500HD / 3500HD
Randys Transmissions 311241031 Stage 2 Allison 1000 Transmission 700HP Max | 01-17 GM 6.6L Duramax 2500HD / 3500HD
- Ships from Manufacturer in 2-3 Weeks
$6,995.00
View Details
Item In Cart 01-19 GM 6.6L Duramax 2500HD / 3500HD  SDP Built Allison Transmission w/ Billet Torque Converter
01-19 GM 6.6L Duramax 2500HD / 3500HD SDP Built Allison Transmission w/ Billet Torque Converter
- Call 208-719-7400 for Availablity
$4,175.00
View Details
Item In Cart ATS 3099134290 Lct1000 5 Speed Stage 1 Package | 04.5-05 GM 2500/3500HD 2WD
ATS 3099134290 Lct1000 5 Speed Stage 1 Package | 04.5-05 GM 2500/3500HD 2WD
- Ships from Manufacturer in 3-4 Weeks
$4,800.95
View Details
Item In Cart ATS 3099654290 Lct1000 5 Speed Stage 6 Package | 04.5-05 GM 2500/3500 HD 4WD
ATS 3099654290 Lct1000 5 Speed Stage 6 Package | 04.5-05 GM 2500/3500 HD 4WD
- Ships from Manufacturer in 3-4 Weeks
$10,556.00
View Details
Item In Cart ATS 3099634290 Lct1000 5 Speed Stage 6 Package | 04.5-05 GM 2500/3500HD 2WD
ATS 3099634290 Lct1000 5 Speed Stage 6 Package | 04.5-05 GM 2500/3500HD 2WD
- Ships from Manufacturer in 3-4 Weeks
$9,688.18
View Details
Item In Cart ATS 3099554290 Lct1000 5 Speed Stage 5 Package | 04.5-05 GM 2500/3500 HD 4WD
ATS 3099554290 Lct1000 5 Speed Stage 5 Package | 04.5-05 GM 2500/3500 HD 4WD
- Ships from Manufacturer in 3-4 Weeks
$9,505.48
View Details
Item In Cart ATS 3099534290 Lct1000 5 Speed Stage 5 Package | 04.5-05 GM 2500/3500HD 2WD
ATS 3099534290 Lct1000 5 Speed Stage 5 Package | 04.5-05 GM 2500/3500HD 2WD
- Ships from Manufacturer in 3-4 Weeks
$9,688.18
View Details
Item In Cart ATS 3099454290 Lct1000 5 Speed Stage 4 Package | 04.5-05 GM 2500/3500 HD 4WD
ATS 3099454290 Lct1000 5 Speed Stage 4 Package | 04.5-05 GM 2500/3500 HD 4WD
- Ships from Manufacturer in 3-4 Weeks
$8,637.65
View Details
Item In Cart ATS 3099434290 Lct1000 5 Speed Stage 4 Package | 04.5-05 GM 2500/3500HD 2WD
ATS 3099434290 Lct1000 5 Speed Stage 4 Package | 04.5-05 GM 2500/3500HD 2WD
- Ships from Manufacturer in 3-4 Weeks
$8,637.65
View Details
Item In Cart ATS 3099354290 Lct1000 5 Speed Stage 3 Package | 04.5-05 GM 2500/3500 HD 4WD
ATS 3099354290 Lct1000 5 Speed Stage 3 Package | 04.5-05 GM 2500/3500 HD 4WD
- Ships from Manufacturer in 3-4 Weeks
$6,607.65
View Details
Item In Cart ATS 3098654290 Stage 6 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY PTO 4WD
ATS 3098654290 Stage 6 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY PTO 4WD
- Ships from Manufacturer in 3-4 Weeks
$10,611.45
View Details
Item In Cart ATS 3098644290 Stage 6 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY 4WD
ATS 3098644290 Stage 6 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY 4WD
- Ships from Manufacturer in 3-4 Weeks
$10,611.45
View Details
Item In Cart ATS 3098554290 Stage 5 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY PTO 4WD
ATS 3098554290 Stage 5 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY PTO 4WD
- Ships from Manufacturer in 3-4 Weeks
$8,576.95
View Details
Item In Cart ATS 3098544290 Stage 5 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY 4WD
ATS 3098544290 Stage 5 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY 4WD
- Ships from Manufacturer in 3-4 Weeks
$8,576.95
View Details
Item In Cart ATS 3098534290 Stage 5 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY 2WD PTO
ATS 3098534290 Stage 5 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY 2WD PTO
- Ships from Manufacturer in 3-4 Weeks
$9,861.45
View Details
Item In Cart ATS 3098524290 Stage 5 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY 2WD
ATS 3098524290 Stage 5 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY 2WD
- Ships from Manufacturer in 3-4 Weeks
$9,861.45
View Details
Item In Cart ATS 3098454290 Stage 4 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY PTO 4WD
ATS 3098454290 Stage 4 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY PTO 4WD
- Ships from Manufacturer in 3-4 Weeks
$8,081.95
View Details
Item In Cart ATS 3098444290 Stage 4 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY 4WD
ATS 3098444290 Stage 4 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY 4WD
- Ships from Manufacturer in 3-4 Weeks
$8,081.95
View Details
Item In Cart ATS 3098434290 Stage 4 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY 2WD PTO
ATS 3098434290 Stage 4 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY 2WD PTO
- Ships from Manufacturer in 3-4 Weeks
$7,826.95
View Details
Item In Cart ATS 3098424290 Stage 4 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY 2WD
ATS 3098424290 Stage 4 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY 2WD
- Ships from Manufacturer in 3-4 Weeks
$7,826.95
View Details
Item In Cart ATS 3098354290 Stage 3 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY PTO 4WD
ATS 3098354290 Stage 3 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY PTO 4WD
- Ships from Manufacturer in 3-4 Weeks
$7,331.95
View Details
Item In Cart ATS 3098344290 Stage 3 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY 4WD
ATS 3098344290 Stage 3 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY 4WD
- Ships from Manufacturer in 3-4 Weeks
$7,331.95
View Details
Item In Cart ATS 3098334290 Stage 3 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY 2WD PTO
ATS 3098334290 Stage 3 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY 2WD PTO
- Ships from Manufacturer in 3-4 Weeks
$7,331.95
View Details
Item In Cart ATS 3098324290 Stage 3 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY 2WD
ATS 3098324290 Stage 3 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY 2WD
- Ships from Manufacturer in 3-4 Weeks
$7,331.95
View Details
Item In Cart ATS 3098254290 Stage 2 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY PTO 4WD
ATS 3098254290 Stage 2 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY PTO 4WD
- Ships from Manufacturer in 3-4 Weeks
$6,538.95
View Details
Item In Cart ATS 3098244290 Stage 2 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY 4WD
ATS 3098244290 Stage 2 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY 4WD
- Ships from Manufacturer in 3-4 Weeks
$6,538.95
View Details
Item In Cart ATS 3098234290 Stage 2 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY 2WD PTO
ATS 3098234290 Stage 2 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY 2WD PTO
- Ships from Manufacturer in 3-4 Weeks
$6,538.95
View Details
Item In Cart ATS 3098224290 Stage 2 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY 2WD
ATS 3098224290 Stage 2 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY 2WD
- Ships from Manufacturer in 3-4 Weeks
$6,538.95
View Details
Item In Cart ATS 3098154290 Stage 1 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY PTO 4WD
ATS 3098154290 Stage 1 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY PTO 4WD
- Ships from Manufacturer in 3-4 Weeks
$5,363.95
View Details
Item In Cart ATS 3098144290 Stage 1 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY 4WD
ATS 3098144290 Stage 1 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY 4WD
- Ships from Manufacturer in 3-4 Weeks
$5,363.95
View Details
Item In Cart ATS 3098134290 Stage 1 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY 2WD PTO
ATS 3098134290 Stage 1 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY 2WD PTO
- Ships from Manufacturer in 3-4 Weeks
$5,363.95
View Details
Item In Cart ATS 3098124290 Stage 1 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD  LLY 2WD
ATS 3098124290 Stage 1 Allison LCT1000 Crate Transmission | 04.5-05 GM 6.6L Duramax 2500HD / 3500HD LLY 2WD
- Ships from Manufacturer in 3-4 Weeks
$5,363.95
View Details
Item In Cart 04.5-05 GM 2500/3500HD 6.6L Duramax LLY 4WD Suncoast Guardian Transmission with Converter Package
04.5-05 GM 2500/3500HD 6.6L Duramax LLY 4WD Suncoast Guardian Transmission with Converter Package
- Ships in 3-5 Business Days
$6,995.00
View Details
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      • Leveling Kits
      • Lift Kits
      • Tonneau Covers
      • Exterior
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    • 2001-2004 Duramax LB7
      • Engine Upgrades
      • Exhaust Kits
      • Leveling Kits
      • Lift Kits
      • Tonneau Covers
      • Exterior
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  • Powerstroke
    • 2020-2022 6.7L Powerstroke
      • Engine Upgrades
      • Exhaust Kits
      • Leveling Kits
      • Lift Kits
      • Tonneau Covers
      • Exterior
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    • 2017-2019 6.7L Powerstroke
      • Engine Upgrades
      • Exhaust Kits
      • Leveling Kits
      • Lift Kits
      • Tonneau Covers
      • Exterior
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    • 2011-2016 6.7L Powerstroke
      • Engine Upgrades
      • Exhaust Kits
      • Leveling Kits
      • Lift Kits
      • Tonneau Covers
      • Exterior
      • View More
    • 2008-2010 6.4L Powerstroke
      • Engine Upgrades
      • Exhaust Kits
      • Leveling Kits
      • Lift Kits
      • Tonneau Covers
      • Exterior
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    • 2003-2007 6.0L Powerstroke
      • Engine Upgrades
      • Exhaust Kits
      • Leveling Kits
      • Lift Kits
      • Tonneau Covers
      • Exterior
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  • Cummins
    • 2019-2022 6.7L Cummins
      • Engine Upgrades
      • Exhaust Kits
      • Leveling Kits
      • Lift Kits
      • Tonneau Covers
      • Exterior
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    • 2013-2018 6.7L Cummins
      • Engine Upgrades
      • Exhaust Kits
      • Leveling Kits
      • Lift Kits
      • Tonneau Covers
      • Exterior
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    • 2010-2012 6.7L Cummins
      • Engine Upgrades
      • Exhaust Kits
      • Leveling Kits
      • Lift Kits
      • Tonneau Covers
      • Exterior
      • View More
    • 2007.5-2009 6.7L Cummins
      • Engine Upgrades
      • Exhaust Kits
      • Leveling Kits
      • Lift Kits
      • Tonneau Covers
      • Exterior
      • View More
    • 2004.5-2007 5.9L Cummins
      • Engine Upgrades
      • Exhaust Kits
      • Leveling Kits
      • Lift Kits
      • Tonneau Covers
      • Exterior
      • View More
    • 2003-2004 5.9L Cummins
      • Engine Upgrades
      • Exhaust Kits
      • Leveling Kits
      • Lift Kits
      • Tonneau Covers
      • Exterior
      • View More

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