Symptoms:

  • Intermittent harsh shifts
  • 1-2 Soft
  • 2-3 Soft
  • Low line rise
  • Low EPC pressure

Cause:

Severe wear of line pressure modulator sleeve allows EPC oil leakage and /or plunger valve hang-up.

Correction:

Sonnax offers four variations of this line pressure modulator plunger valve kit that prevent excessive EPC oil loss.

4R100, E4OD

Line Pressure Modulator Plunger Valve Kit
Part No. 36948-03K

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Some Ford E4OD and 4R100 transmissions have soft 1-2 or 2-3 shifts, intermittent harsh shifts or poor line rise complaints. These can be caused by ECU (electronic control unit) or accumulator pressure problems. Severe wear of the line pressure modulator sleeve allows EPC (electronic pressure control) oil to leak past the valve and cause soft shifts. Severe wear can also cause the valve to stick or hang up, causing harsh shifts. Sonnax line pressure modulator plunger valve kit 36948-03K eliminates this oil loss problem in listed units.

  • Sleeve is manufactured from carbon steel to prevent excessive wear
  • Valve is made from hardened alloy steel for better wear resistance
  • O-Ring helps prevent EPC oil loss.
  • Annular grooves center valve in sleeve and eliminate sideloading
  • Improves shift firmness
OE Application OE Valve Diameter Sonnax Part No.
6-Cylinder & Small 8-Cylinder Applications .331" 36948-03K
Large 8-Cylinder Applications .372" 36948-05K
Heavy Duty/High Performance or Stock AX4N ('97-Earlier) Replacement .427" 96948-01K
Extreme Heavy Duty/High Performance .500" 96948-05K

Learn More About Zip Valve™ Drop-In Repairs
  • Plunger Valve
  • Sleeve
  • O-Ring
  • Dia.: 0.331"
  • 4R100, E4OD Line Pressure Modulator Plunger Valve Kit 36948-03K
  • 4R100, E4OD Line Pressure Modulator Plunger Valve Kit 36948-03K