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


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


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

4R100, AX4N, E4OD

Line Pressure Modulator Plunger Valve Kit
Part No. 96948-01K

.427" dia.

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Some E4OD, 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 offers four size variations of the line pressure modulator sleeve and valve kit that eliminate this oil loss problem.

  • 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 side loading.
  • Improves shift firmness.

Heavy Duty/High Performance: .427", or stock AX4N (97-earlier) replacement

  • Valve
  • Sleeve
  • O-Ring
  • Dia.: 0.427"

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 AX4N/4F50N Valve Body Layout

Ford ax4n 450n

September 28, 2017

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  • 96948 01k combo
  • 96948 01k