Symptoms:

  • Code 628, 741, 1741, 1744
  • No lockup
  • TCC slip
  • Low cooler flow

Cause:

Excessive wear at the bypass clutch control valve bore.

Correction:

Recondition the bore and install Sonnax oversized bypass clutch control valve.

4R70E, 4R70W, 4R75E, 4R75W, AODE

Oversized Bypass Clutch Control Valve
Part No. 76948-31


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TCC codes, shuttle or loss of lockup can indicate a bypass control problem in listed Ford applications. A worn bypass clutch control bore or valve will lower converter and TCC apply pressure. Sonnax oversized bypass clutch control valve and tool kit 76948-31 salvages affected valve bodies, allowing you to ream the bore to accept the oversized valve, restoring proper function to the bypass control circuit.

  • Salvages valve bodies with wear of the bypass clutch control bore or valve
  • Corrects TCC codes, shuttle/loss of lockup, converter overheat and reduced/lost cooler flow
  • Provides increased valve support for longer service life

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

Ford AODE, 4R70W, 4R75W, 4R70E, 4R75E Valve Body Layout

Ford AODE, 4R70W, 4R75W, 4R70E, 4R75E Valve Body Layout
  • 4R70E, 4R70W, 4R75E, 4R75W, AODE Oversized Bypass Clutch Control Valve 76948-31
  • 4R70E, 4R70W, 4R75E, 4R75W, AODE Oversized Bypass Clutch Control Valve 76948-31

You need this if...

4R70E, 4R70W, 4R75E, 4R75W, AODE Oversized Bypass Clutch Control Valve Vacuum Test Locations