2004.5-2005 GM 2500HD/3500HD 6.6L LL Duramax Exterior Upgrades

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

2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Bed Liners

Bed Liners

2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Bed Racks

Bed Racks

2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Bull Bars

Bull Bars

2004.5-2005 GM 2500HD/3500HD 6.6L LL Duramax Bumpers

Bumpers

2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Fender Flares

Fender Flares

2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Mud Flaps

Mud Flaps

2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Roof Racks

Roof Racks

2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Side Steps

Side Steps

2004.5-2005 GM 2500HD/3500HD 6.6L LL Duramax Tonneau Covers

Tonneau Covers

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AMP Research 19-04280-STA Replacement Controller Module | Universal
AMP Research 19-04280-STA Replacement Controller Module | Universal
AMP Research 19-04280-STA Replacement Controller Module | Universal
AMP Research 19-04280-STA Replacement Controller Module | Universal

AMP Research

AMP Research 19-04280-STA Replacement Controller Module | Universal

SKU: AMP19-04280-STA
$99.99
Merchant 10008 Wheel Well Liner Clips | 2001-2007 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax
Merchant 10008 Wheel Well Liner Clips | 2001-2007 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

Merchant Automotive

Merchant 10008 Wheel Well Liner Clips | 2001-2007 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax

SKU: MAT10008
$4.92
AMP Research 76404-01A OBD-II Splitter | Universal
AMP Research 76404-01A OBD-II Splitter | Universal
AMP Research 76404-01A OBD-II Splitter | Universal
AMP Research 76404-01A OBD-II Splitter | Universal

AMP Research

AMP Research 76404-01A OBD-II Splitter | Universal

SKU: AMP76404-01A
$119.99
S&B 84-1001 Mud Flaps for 2.5 inch Hitch Receivers | Universal
S&B 84-1001 Mud Flaps for 2.5 inch Hitch Receivers | Universal
S&B 84-1001 Mud Flaps for 2.5 inch Hitch Receivers | Universal
S&B 84-1001 Mud Flaps for 2.5 inch Hitch Receivers | Universal
S&B 84-1001 Mud Flaps for 2.5 inch Hitch Receivers | Universal

S&B Filters

S&B 84-1001 Mud Flaps for 2.5 inch Hitch Receivers | Universal

SKU: SAB84-1001
$349
AMP Research 74608-01A BedXtender HD Quick Mount Bracket Kit | Universal
AMP Research 74608-01A BedXtender HD Quick Mount Bracket Kit | Universal
AMP Research 74608-01A BedXtender HD Quick Mount Bracket Kit | Universal

AMP Research

AMP Research 74608-01A BedXtender HD Quick Mount Bracket Kit | Universal

SKU: AMP74608-01A
$29.99
Rugged Liner WWC99 Wheel Well Rear Inner Liner | 1999-2006 GM 2500HD/3500HD Silverado/Sierra
Rugged Liner WWC99 Wheel Well Rear Inner Liner | 1999-2006 GM 2500HD/3500HD Silverado/Sierra

Rugged Liner

Rugged Liner WWC99 Wheel Well Rear Inner Liner | 1999-2006 GM 2500HD/3500HD Silverado/Sierra

SKU: RUGWWC99
$139
Rugged Liner C8U99 Under Rail Bed Liner | 1999-2006 GM 2500HD/3500HD 8ft Bed
Rugged Liner C8U99 Under Rail Bed Liner | 1999-2006 GM 2500HD/3500HD 8ft Bed
Rugged Liner C8U99 Under Rail Bed Liner | 1999-2006 GM 2500HD/3500HD 8ft Bed
Rugged Liner C8U99 Under Rail Bed Liner | 1999-2006 GM 2500HD/3500HD 8ft Bed
Rugged Liner C8U99 Under Rail Bed Liner | 1999-2006 GM 2500HD/3500HD 8ft Bed
Rugged Liner C8U99 Under Rail Bed Liner | 1999-2006 GM 2500HD/3500HD 8ft Bed

Rugged Liner

Rugged Liner C8U99 Under Rail Bed Liner | 1999-2006 GM 2500HD/3500HD 8ft Bed

SKU: RUGC8U99
$279
Rugged Liner C8OR99 Over Rail Bed Liner | 1999-2006 GM 2500HD/3500HD 8ft Bed
Rugged Liner C8OR99 Over Rail Bed Liner | 1999-2006 GM 2500HD/3500HD 8ft Bed

Rugged Liner

Rugged Liner C8OR99 Over Rail Bed Liner | 1999-2006 GM 2500HD/3500HD 8ft Bed

SKU: RUGC8OR99
$279
Rugged Liner C65U99 Under Rail Bed Liner | 1999-2006 GM 2500HD/3500HD 6.5ft Bed
Rugged Liner C65U99 Under Rail Bed Liner | 1999-2006 GM 2500HD/3500HD 6.5ft Bed
Rugged Liner C65U99 Under Rail Bed Liner | 1999-2006 GM 2500HD/3500HD 6.5ft Bed
Rugged Liner C65U99 Under Rail Bed Liner | 1999-2006 GM 2500HD/3500HD 6.5ft Bed
Rugged Liner C65U99 Under Rail Bed Liner | 1999-2006 GM 2500HD/3500HD 6.5ft Bed
Rugged Liner C65U99 Under Rail Bed Liner | 1999-2006 GM 2500HD/3500HD 6.5ft Bed

Rugged Liner

Rugged Liner C65U99 Under Rail Bed Liner | 1999-2006 GM 2500HD/3500HD 6.5ft Bed

SKU: RUGC65U99
$279
Rugged Liner C65OR99 Over Rail Bed Liner | 1999-2006 GM 2500HD/3500HD 6.5ft Bed
Rugged Liner C65OR99 Over Rail Bed Liner | 1999-2006 GM 2500HD/3500HD 6.5ft Bed

Rugged Liner

Rugged Liner C65OR99 Over Rail Bed Liner | 1999-2006 GM 2500HD/3500HD 6.5ft Bed

SKU: RUGC65OR99
$279
AMP Research 75400-01A Bed Step 2 | 1999-2014 GM Silverado/Sierra 1500
AMP Research 75400-01A Bed Step 2 | 1999-2014 GM Silverado/Sierra 1500
AMP Research 75400-01A Bed Step 2 | 1999-2014 GM Silverado/Sierra 1500

AMP Research

AMP Research 75400-01A Bed Step 2 | 1999-2014 GM Silverado/Sierra 1500

SKU: AMP75400-01A
$329.99
BedRug BRZSPRAYON Spray-In Adhesion Kit for BedRug Liners & Mats | Universal
BedRug BRZSPRAYON Spray-In Adhesion Kit for BedRug Liners & Mats | Universal
BedRug BRZSPRAYON Spray-In Adhesion Kit for BedRug Liners & Mats | Universal

BedRug

BedRug BRZSPRAYON Spray-In Adhesion Kit for BedRug Liners & Mats | Universal

SKU: BEDBRZSPRAYON
$19.95

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

Power Lift Shop All

If you want to transform your 2004.5-2005 GM 6.6L Duramax LLY build into a truck you can truly call your own, choose from our vast selection of exterior parts and upgrades available here at Alligator Performance. The right combination of exterior upgrades on your Sierra/Silverado will turn heads each time you get behind the wheel. Whether you're looking for some bolt-on fender flares for a quick and easy upgrade, or a premium roof rack for improved cargo carrying capacity, we have it all. Better yet, you can shop and drive with confidence knowing we only work with the most trusted and reliable names in the business. Once you've finished outfitting your exterior, head over and check out our selection of GM 2500/3500 Wheels & Tires to complete your custom build! 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
Side Steps
Fender Flares
Grilles
Mud Flaps
Roof Racks

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The Garage

Welcome to The Garage – your one-stop shop for all your car care and maintenance needs. From premium oils and filters to top-notch car care products, we have everything you need to keep your vehicle running smoothly and looking its best. Whether you're a DIY enthusiast or a professional mechanic, our carefully curated selection of high-quality products will help you take care of your ride like never before.

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