2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Rebuild Kits & Internal Parts

Whether you're upgrading or maintaining your GM 2500HD/3500HD's transmission, we provide a comprehensive selection of rebuild kits and internal components to simplify the process. From enhancing durability with a high-strength billet input shaft to upgrading to a high-performance overdrive clutch drum for handling extreme power, or refreshing your transmission with new gaskets, bearings, and clutches, we have everything you need! Equip your transmission with the heavy-duty internal parts and upgrades it requires to perform flawlessly in your GM 2500HD/3500HD! Pair your new rebuild kits and internal parts with our selection of Engine Upgrades! 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
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SunCoast GMAX-CAT4-LB7/LLY-KIT-LC CAT 4 950+ HP Custom Allison Rebuild Kit - No Converter | 2004-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
SunCoast GMAX-CAT4-LB7/LLY-KIT-LC CAT 4 950+ HP Custom Allison Rebuild Kit - No Converter | 2004-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SunCoast Performance

SunCoast GMAX-CAT4-LB7/LLY-KIT-LC CAT 4 950+ HP Custom Allison Rebuild Kit - No Converter | 2004-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: SUNGMAX-CAT4-LB7/LLY-KIT-LC
Price
$7,755.15
SunCoast GMAX-CAT2-LB7/LLY-KIT CAT 2 600HP Custom Allison Rebuild Kit with Converter | 2004-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
SunCoast GMAX-CAT2-LB7/LLY-KIT CAT 2 600HP Custom Allison Rebuild Kit with Converter | 2004-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SunCoast Performance

SunCoast GMAX-CAT2-LB7/LLY-KIT CAT 2 600HP Custom Allison Rebuild Kit with Converter | 2004-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: SUNGMAX-CAT2-LB7/LLY-KIT
Price
$6,615.16
SunCoast GMAX-CAT1-LB7/LLY-KIT-LC Allison Category 1 500HP Capable Transmission Rebuild Kit with outut Converter | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
SunCoast GMAX-CAT1-LB7/LLY-KIT-LC Allison Category 1 500HP Capable Transmission Rebuild Kit with outut Converter | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SunCoast Performance

SunCoast GMAX-CAT1-LB7/LLY-KIT-LC Allison Category 1 500HP Capable Transmission Rebuild Kit with outut Converter | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: SUNGMAX-CAT1-LB7/LLY-KIT-LC
Price
$3,099.15
SunCoast GMAX-CAT0-LB7/LLY-KIT-LC Category 0 Allison Refresh Kit with outut Converter | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
SunCoast GMAX-CAT0-LB7/LLY-KIT-LC Category 0 Allison Refresh Kit with outut Converter | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SunCoast Performance

SunCoast GMAX-CAT0-LB7/LLY-KIT-LC Category 0 Allison Refresh Kit with outut Converter | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: SUNGMAX-CAT0-LB7/LLY-KIT-LC
Price
$1,547.15
SunCoast A1-VB-02 Allison Valve Body | 2002 GM 2500HD/3500HD 6.6L Duramax
SunCoast A1-VB-02 Allison Valve Body | 2002 GM 2500HD/3500HD 6.6L Duramax

SunCoast Performance

SunCoast A1-VB-02 Allison Valve Body | 2002 GM 2500HD/3500HD 6.6L Duramax

SKU: SUNA1-VB-02
Price
$1,547.15
ATS 303-010-4290 Allison Pressure Regulator Valve | 2004-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

ATS Diesel Performance

ATS 303-010-4290 Allison Pressure Regulator Valve | 2004-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

SKU: ATS303-010-4290
Price
$109.42
ATS 303-900-4272 Allison Performance Valve Body | 2003-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
ATS 303-900-4272 Allison Performance Valve Body | 2003-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

ATS Diesel Performance

ATS 303-900-4272 Allison Performance Valve Body | 2003-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: ATS303-900-4272
Price
$857.68
ATS 303-904-4248 Allison Trim Valve Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
ATS 303-904-4248 Allison Trim Valve Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

ATS Diesel Performance

ATS 303-904-4248 Allison Trim Valve Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: ATS303-904-4248
Price
$154.50
ATS 304-910-4248 Allison Billet Input Shaft | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
ATS 304-910-4248 Allison Billet Input Shaft | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

ATS Diesel Performance

ATS 304-910-4248 Allison Billet Input Shaft | 2001-2016 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: ATS304-910-4248
Price
$793
ATS 308-805-4248 Allison C5 Clutch Pack | 2001-2010 GM 2500HD/3500HD 6.6L Duramax
ATS 308-805-4248 Allison C5 Clutch Pack | 2001-2010 GM 2500HD/3500HD 6.6L Duramax

ATS Diesel Performance

ATS 308-805-4248 Allison C5 Clutch Pack | 2001-2010 GM 2500HD/3500HD 6.6L Duramax

SKU: ATS308-805-4248
Price
$304.50
ATS 313-906-4290 Allison Transmission Stage 6 Rebuild Kit | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY
ATS 313-906-4290 Allison Transmission Stage 6 Rebuild Kit | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

ATS Diesel Performance

ATS 313-906-4290 Allison Transmission Stage 6 Rebuild Kit | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

SKU: ATS313-906-4290
Price
$3,298.75
ATS 313-907-4290 Allison Transmission Stage 7 Rebuild Kit | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY
ATS 313-907-4290 Allison Transmission Stage 7 Rebuild Kit | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

ATS Diesel Performance

ATS 313-907-4290 Allison Transmission Stage 7 Rebuild Kit | 2004.5-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LLY

SKU: ATS313-907-4290
Price
$4,308.68

2004.5-2005 6.6L Silverado & Sierra 2500HD/3500HD

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