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


You need this if... View Instructions Find a Distributor

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
  • 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