XDP XD355 HD High Output Alternator (Wrinkle Black) – 2001-2007 GM 6.6L Duramax LB7/LLY/LBZ

Upgrade the charging system on your 2001-2007 Chevrolet or GMC 2500/3500 HD with the XDP XD355 HD High Output Alternator. This direct bolt-on unit delivers 220 amp peak output and 150 amps at idle—substantially more capacity than a typical stock alternator—so your truck can reliably support aftermarket accessories without constantly draining the batteries.

Popular add-ons such as off-road lights, snow plows, onboard air compressors, high-power stereos, horn kits, and other electronics often overwhelm the factory charging system. The XD355 is built to handle those demands while maintaining stable voltage under load.

Key Features

• 220 amp peak output / 150 amp output at idle
• 100% brand new (no core charge or return required)
• Direct bolt-on design using factory mounting points, factory belt, and existing electrical connections
• Ultra-durable wrinkle black finish for improved under-hood appearance and corrosion resistance
• Pre-tested with results card included
• Optional ground lug (requires user-supplied ground wire to the battery if utilized)

Fitment 2001–2007 GM 6.6L Duramax

• LB7 (2001–2004)
• LLY (2004.5–2005)
• LBZ (2006–2007)

Warranty 2-Year / Unlimited Mileage manufacturer warranty.

Ready for straightforward installation and built for the electrical demands of a modified or hard-working Duramax.