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  • Reduced lube oil from the center support
  • 2nd Gear starts
  • 3rd Gear starts
  • TCC cycling
  • TCC slip


All solenoid regulator valve (SRV) solenoid feed oil and intermediate lube oil passes through the solenoid regulator valve. When the bore wears, critical solenoid feed oil and intermediate lube fluid leaks to exhaust causing shift related problems and loss of lube.


These Sonnax oversized solenoid regulator valves restore SRV pressure.

4R100, E4OD

Oversized Solenoid Regulator Valve
Part No. 36947-14

Fits late-style, ‘96-later, two-spool valve version.

You need this if... View Instructions

Sonnax offers 36947-14 and 36948-22, solenoid regulator valves and their tool kits to salvage worn valve bodies and restore proper solenoid regulator valve (SRV) circuit function in both early- and late-style E4OD and 4R100 units. Bore wear at the SRV reduces oil supplied to the shift, TCC and coast clutch solenoids. This regulated pressure also feeds the intermediate or center support area. The '96-later valve bodies incorporated a two-spool anodized aluminum valve that is prone to flaking of the anodized layer, causing premature wear of valve and bore. The '95-earlier have a three-spool steel valve that wears the bore, resulting in excess clearance when hot.

  • Sonnax aluminum valve is hard-coat anodized to increase wear resistance
  • Annular grooves center the valve hydraulically to prevent wear
  • 36947 14 combo
  • 36947 14

You need this if...

A wet air test in the location indicated with the valve blocked inward results in leakage out the neighboring line port, or a vacuum test of the balance port gives less than 18" of vacuum.

  • 36947 14 test