Duramax LLY LBZ LMM PowerMax Stage 1 Turbocharger | 773540-5001S | Garrett GT3794VA | New

Garrett PowerMax GT3794VA Stage 1 turbocharger (part number 773540-5001S) for 2004.5–2010 GM 6.6L Duramax LLY, LBZ, and LMM engines (Silverado/Sierra 2500HD/3500HD). This is a drop-in performance upgrade over the factory turbo — a larger 65 mm compressor wheel that supports up to approximately 500 HP while retaining the factory electronics. It is a new Garrett unit, no core charge.

Key Features:

• Garrett PowerMax GT3794VA Stage 1 upgrade turbocharger, part number 773540-5001S
• 65 mm compressor wheel — larger than the stock GT3788VA for increased airflow
• Supports up to approximately 500 HP while retaining factory electronics
• Ball-bearing center section with Garrett's Advanced Variable Nozzle Turbine (AVNT) design
• Direct drop-in fit for 2004.5–2010 LLY/LBZ/LMM Duramax

Specifications:

• Base part number: 773540-5001S (Garrett)
• Turbocharger model: Garrett PowerMax GT3794VA (variable geometry, ball bearing)
• Component type: Turbocharger assembly (Stage 1 upgrade)
• Compressor wheel: 65 mm
• Supported output: up to ~500 HP (tuning recommended)
• Condition: New (no core charge)
• Engine: GM 6.6L Duramax
• Engine codes: LLY, LBZ, LMM
• Years: 2004.5–2010

Compatibility / Fitment:

• Fits 2004.5–2010 GM 6.6L Duramax with the LLY, LBZ, or LMM engine code (Silverado/Sierra 2500HD/3500HD)
• This is a performance upgrade over stock — for a factory-spec stock replacement, use the GT3788VA (848212-5001S) instead
• Does NOT fit LB7 (2001–2004) or LML (2011+) — those use different turbo platforms
• Tuning is recommended to realize the added airflow; gaskets are not included
• Per Garrett's service bulletin, the air-inlet-adapter tabs must be removed for proper fit; 2004.5–2005 LLY may require the vane position sensor adapter
• Confirm your engine code (8th digit of the VIN: 2 = LLY, D = LBZ, 6 = LMM) before ordering

Conclusion:

The Garrett 773540-5001S is a PowerMax GT3794VA Stage 1 upgrade turbocharger for 2004.5–2010 GM 6.6L Duramax LLY/LBZ/LMM engines, using a larger 65 mm compressor wheel to support up to approximately 500 HP while keeping the factory electronics. It's a new drop-in unit with no core charge. For a factory-spec replacement instead, use the stock GT3788VA (848212-5001S); confirm your engine code before ordering.