Warning:

GM Gen. 1 and Gen. 2 6T40, 6T45 and 6T50 valve bodies cannot be interchanged but are very similar in appearance. Reference the Sonnax identification guide to verify the correct valve body is installed.

6T40 (Gen. 1), 6T45 (Gen.1), 6T50 (Gen. 1)

Remanufactured Valve Body
Part No. GM6T40-1

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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
  • 6T40 (Gen. 1), 6T45 (Gen.1), 6T50 (Gen. 1) Remanufactured Valve Body GM6T40-1
  • 6T40 (Gen. 1), 6T45 (Gen.1), 6T50 (Gen. 1) Remanufactured Valve Body GM6T40-1 details

GM Gen. 1 6T40, 6T45, 6T50 Series Identification Guide


Generation 1

Generation 2

Front Pump

Generation 1

Generation 2

View of Pressure Regulator Valve in Pump Port

Generation 1

Generation 2

Main Valve Body, Lower Side

Generation 1

Generation 2

Valve Body, Upper Cover


Generation 1

Generation 2

TEHCM, Lower Side

Generation 1

Generation 2

TEHCM, Upper Side

Generation 1

Generation 2

TEHCM ID Plate
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