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USD 419.95
Part #: XD355

XDP HD High Output Alternator (New) Wrinkle Black XD355

Vehicle Fitment:
2001-2007 GM 6.6L Duramax LB7/LLY/LBZ | See full application list below
Part #: XD355
★★★★★ ★★★★★ 5 Reviews
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Increase the output of the charging system in your 2001-2007 GM 6.6L Duramax with the XDP HD High Output Alternator (New) Wrinkle Black XD355. The Duramax engine is a known powerhouse that is easy to modify, but the charging system is often forgotten about until there is an issue. The demands of popular add-on accessories like aftermarket horn kits, on-board air compressors, off-road lights, plows, stereo equipment, and other electronics can quickly exceed what your factory alternator can support. 

The XDP HD Series Alternators increase the output of your charging system and allow your truck to keep up with any aftermarket upgrades you choose to install. Whether you're out plowing snow all night, or need to light up the trail with your off-road lights, the XDP HD Series Alternators have you covered! Each unit features an ultra-durable wrinkle black coating for enhanced underhood aesthetics and corrosion resistance. The XD355 comes pre-tested with a results card included and ready to install using factory mounting locations, factory belt, and existing connections.  
  • Bolt-On Upgrade
  • 220 Amp Peak Output
  • 150 Amp Output At Idle
  • 100% Brand New, No Core! 
  • Pre-Tested With Included Results

Vehicle Fitment

2001 Chevrolet Silverado 2500 HD 6.6
2002 Chevrolet Silverado 2500 HD 6.6
2003 Chevrolet Silverado 2500 HD 6.6
2004 Chevrolet Silverado 2500 HD 6.6
2005 Chevrolet Silverado 2500 HD 6.6
2006 Chevrolet Silverado 2500 HD 6.6
2007 Chevrolet Silverado 2500 HD 6.6
2007 Chevrolet Silverado 2500 HD Classic 6.6
2001 Chevrolet Silverado 3500 6.6
2002 Chevrolet Silverado 3500 6.6
2003 Chevrolet Silverado 3500 6.6
2004 Chevrolet Silverado 3500 6.6
2005 Chevrolet Silverado 3500 6.6
2006 Chevrolet Silverado 3500 6.6
2007 Chevrolet Silverado 3500 Classic 6.6
2007 Chevrolet Silverado 3500 HD 6.6
2001 GMC Sierra 2500 HD 6.6
2002 GMC Sierra 2500 HD 6.6
2003 GMC Sierra 2500 HD 6.6
2004 GMC Sierra 2500 HD 6.6
2005 GMC Sierra 2500 HD 6.6
2006 GMC Sierra 2500 HD 6.6
2007 GMC Sierra 2500 HD 6.6
2007 GMC Sierra 2500 HD Classic 6.6
2001 GMC Sierra 3500 6.6
2002 GMC Sierra 3500 6.6
2003 GMC Sierra 3500 6.6
2004 GMC Sierra 3500 6.6
2005 GMC Sierra 3500 6.6
2006 GMC Sierra 3500 6.6
2007 GMC Sierra 3500 Classic 6.6
2007 GMC Sierra 3500 HD 6.6


  • MPN XD355
  • SKU XD355
  • GTIN 856217008885
  • ID 60729
  • Manufacturer Name XDP
  • Shipping Weight 16.00 lb.
  • Shipping Length 10 in.
  • Shipping Width 10 in.
  • Shipping Height 10 in.
  • Fuel Type Diesel
  • Warranty Info 1 Year / Unlimited Mileage
  • Prop 65 Prop 65 WarningWARNING: Cancer & Reproductive Harm -
  • Internal L2R4


★★★★★ ★★★★★
5.0/5 Stars out of 5 Reviews
Verified Buyer
Definitely needed
I run a very high power sound system and running it at night with all the extra lights on was a struggle for the stock alternator, now it doesn't even phase this thing, handles it like a pro. I have a 1/0 power cable running to the junction box and a 4ga ground running to the cab and piggy backed to the battery and frame. It has no problems running dual viair 440c`s 3000 watts in amps and a 32inch ridgid light bar all at the same time.
Verified Buyer
Not 100% plug and play with LBZ
Hoping this will preform as advertised. I have a lot of extra draw on my 2006 LBZ. For example, I got 8k miles and 7 months out of a reman from a national parts shop. Positive charging stud on this alternator is bigger than factory connection. I had to use a round chain saw file to make my factory connection big enough to fit on the alternator stud. Otherwise install went easy as pie.
Verified Buyer
Great Alternator/good buy
I recently purchased my second alternator from XDP the black matte finish high output alternator. Simple to install works great with all my accessories.
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Questions and Answers

Do I or should upgrade my battery cable to accommodate the 220 amp alternator?
View Staff Answer 
The XDP Wrinkle Black HD High Output Alternator XD355 do not require you to upgrade the battery cable but you'll want to look it over for dry rot, cracks, and corrosion.

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