Sonnax remanufactured valve body GM6T40-1 has been designed to address common issues, such as: no 4th, 5th and/or 6th Gear; harsh shifts; flare shifts; burnt clutches; TCC apply concerns; P0741 and 742 codes; delayed engagements; low converter and lube flow; downshift clunks, and a variety of other drivability complaints.

Each bore is inspected, vacuum-tested and repaired as needed to ensure hydraulic integrity and functionality. Built with the time-tested, industry-trusted parts and expertise only Sonnax can deliver, robust VBT 8000 testing guarantees OE performance from every one of these valve bodies.

A TEHCM is not included with the valve body, but is available from OE and various aftermarket sources if required.

• Each bore inspected, tested and repaired as required to ensure hydraulic integrity and functionality
• New, OE bonded separator plate and gaskets installed
• Robust VBT 8000 testing guarantees OE performance from every unit; compensator feed, AFL, clutch, torque converter pressures match new OE specs
• Top-quality Sonnax components optimize valve body function and prevent future wear