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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ATS 313-921-4248 Allison Master Rebuild Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
ATS 313-921-4248 Allison Master Rebuild Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

ATS Diesel Performance

ATS 313-921-4248 Allison Master Rebuild Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: ATS313-921-4248
Sale price
$1,552.95
Regular price
$1,725.50
ATS 313-994-4248 Allison C4 Clutch Pack | 2001-2010 GM 2500HD/3500HD 6.6L Duramax
ATS 313-994-4248 Allison C4 Clutch Pack | 2001-2010 GM 2500HD/3500HD 6.6L Duramax

ATS Diesel Performance

ATS 313-994-4248 Allison C4 Clutch Pack | 2001-2010 GM 2500HD/3500HD 6.6L Duramax

SKU: ATS313-994-4248
Sale price
$150.73
Regular price
$167.48
SunCoast A1-P1B-6 Modified P1 Sun Gear | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
SunCoast A1-P1B-6 Modified P1 Sun Gear | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SunCoast Performance

SunCoast A1-P1B-6 Modified P1 Sun Gear | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: SUNA1-P1B-6
Sale price
$74.20
Regular price
$82.45
SunCoast A1-109600 Billet Input Shaft | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
SunCoast A1-109600 Billet Input Shaft | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SunCoast Performance

SunCoast A1-109600 Billet Input Shaft | 2001-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: SUNA1-109600
Sale price
$654.75
Regular price
$727.50
BD Diesel 1030471 Transmission Valve Body | 2004-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
BD Diesel 1030471 Transmission Valve Body | 2004-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

BD Diesel

BD Diesel 1030471 Transmission Valve Body | 2004-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: BDD1030471
Sale price
$1,084.45
Regular price
$1,204.95
TransGo A1-LU-BST-04 Boost Valve | 2004.5-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
TransGo A1-LU-BST-04 Boost Valve | 2004.5-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

TransGo

TransGo A1-LU-BST-04 Boost Valve | 2004.5-2010 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: RPMA1-LU-BST-04
Price
$90.25
SunCoast ALLISONSK Shift Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7/LLY
SunCoast ALLISONSK Shift Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7/LLY

SunCoast Performance

SunCoast ALLISONSK Shift Kit | 2001-2005 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7/LLY

SKU: SUNALLISONSK
Sale price
$283.72
Regular price
$315.25
PPE 128035590 Stage6G C5 Clutch Pack | 2001-2022 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
PPE 128035590 Stage6G C5 Clutch Pack | 2001-2022 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

PPE

PPE 128035590 Stage6G C5 Clutch Pack | 2001-2022 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: PPE128035590
Price
$269.99

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

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