SOUTH BEND HYDX-MAX HYDRAULIC ASSEMBLY – 2001–2005 6.6L DURAMAX LB7/LLY (ZF-6)

Restore and upgrade the clutch feel on your 6-speed Duramax. The South Bend HYDX-MAX is a complete, heavy-duty hydraulic assembly (master + pre-filled/pre-bled concentric slave) engineered to handle the higher pressures of performance single- and dual-disc clutches while keeping pedal effort smooth and consistent.

• Complete assembly: Master cylinder, line, and pre-filled/pre-bled concentric slave for fast install.
• Built for performance clutches: Handles increased clamp loads and heat for reliable release.
• Improved pedal feel: Smooth, predictable engagement for daily driving and towing.

FITMENT

• Engine: 6.6L Duramax LB7 (2001–2004) and LLY (2004.5–2005)
• Trans: ZF-6 6-speed manual
• Vehicles: 2001–2005 Chevy Silverado / GMC Sierra 2500HD & 3500 with manual transmission

WHAT’S INCLUDED

• New master cylinder with line
• Pre-filled / pre-bled concentric slave cylinder (CSC)
• Reservoir and hardware as supplied by South Bend

CROSS-REFERENCE / ALTERNATIVES

• South Bend HYDX-MAX (this item) – LB7/LLY 2001–2005
• South Bend hydraulic assemblies for other platforms (e.g., NV4500/NV5600) available separately
• Consider pairing with a South Bend Street/Tow clutch for your use case

INSTALL NOTES

• Designed for the factory ZF-6 manual system; verify manual transmission before ordering.
• Bleeding is typically minimal due to pre-bled design; follow South Bend’s instructions.
• Inspect pedal bushings and clutch fork travel when diagnosing release issues.

FAQ

Yes, it ships pre-filled/pre-bled to simplify installation and help ensure consistent pedal feel.

Yes. HYDX-MAX is designed to handle the higher pressures common with upgraded single- and dual-disc clutches.

This listing targets 2001–2005 LB7/LLY applications. Later years and engines may require different hydraulics.

Typically no; the assembly includes master, line, and pre-bled CSC. Always inspect your pedal assembly and hardware and replace worn components as needed.