September 28, 2017
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"
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 E4OD, 4R100 Valve Body Layout
