September 30, 2005
Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits
Gregg Nader
Symptoms:
- Gear ratio & solenoid codes
- Low line rise
- Soft shifts
- Erratic shifts
- No 3rd when hot
- No 4th when hot
- 2nd Gear starts
- Delayed Forward
- TCC apply concerns
Cause:
Loss of oil pressure due to worn components in critical oil circuits.Correction:
Zip Kit seals critical pressure losses. Drop-in parts install quickly and easily.4R44E, 4R55E, 5R44E, 5R55E
Zip Kit®
Part No. 4R44E-5R55E-ZIP
View Instructions
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Sonnax Zip Kit 4R44E-5R55E-ZIP targets the root cause of multiple complaints by sealing the critical circuit pressure losses in the Ford 4R44E, 4R55E, 5R44E and 5R55E valve bodies. The kit contains uniquely designed parts to prevent the loss of pressures within the main line, EPC, solenoid feed and converter circuits. This kit also includes modifications that provide firmer shifts, improves intermediate servo and direct clutch pressure, and improves TCC apply. The kit also seals multiple circuits known to suffer from end plug leakage or poor checkball sealing. No special tools are required for installing these parts.
The Zip Kit quick guide provides clear and easy instructions on one sheet to get the unit sealed up and back on the road fast. In addition to general rebuilding tips and technical information, the technical booklet included in this kit contains vacuum testing and additional repair options for higher mileage units or for repairing specific complaints which are beyond the scope of this kit.
- Drop-in Zip Valve™ parts install quickly and easily, no reaming or special tools required
- Uniquely designed parts address root cause of valve body complaints by sealing critical pressure circuits
- Detailed technical booklet included with in-depth rebuild and inspection tips for comprehensive valve body repair
- Forward Modulator Valve, PTFE Seal, End Plug, Spring, & O-Ring Large O-Ring
- Boost Valve & Sleeve Kit
- Reverse Modulator End Plug & O-Rings 2 Medium O-Rings
- Kick Downshift, Manual Low & Throttle Downshift End Plugs (2) 1 Large, 1 Small
- Kick Downshift, Manual Low & Throttle Downshift O-Rings (6) 2 Large, 4 Small
- Extra End Plug O-Rings (6) 2 Large, 2 Medium, 2 Small
- Checkballs (4) Plastic
- EPC Limit Valve
- Lube Orifice Plug
- “L” Pins (2)
- TCC Apply & OD Servo Apply Pressure Modification Drill Bits (4) .055” dia., .062” dia., .072” dia. & .110” dia. (Not Shown)
- Plug Aluminum, .062” (Not Shown)
- Rivets (3) 2 Extra (Not Shown)
- Shift Solenoid O-Rings (8) 4 Small, 4 Large (Not Shown)
- 2-3/3-4 Shift Valve End Plug & O-Rings 2 Small O-Rings
- 1-2/2-3 Shift Valve End Plug & O-Rings 2 Medium O-Rings
- Converter Regulator Valve End Plug, Spring, & O-Rings 2 Large O-Rings
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 4R44E, 5R44E, 4R55E, 5R55E Valve Body Layout
May 21, 2013
Ford 4R44E, 4R55E, 5R44E, 5R55E Vacuum Test Guide
May 15, 2023
Positive Sealing: The Benefits of O-Ringed End Plugs
Maura Stafford
Videos
Zip Kit® Video - The First Step in Correcting Common Shift Problems
The Sonnax ZIP KIT®
The First Step in Correcting Common Shift Problems
It's easy to restore and extend vehicle shift quality with Zip Kits. Uniquely designed, drop-in Sonnax parts target the root cause of valve body complaints and stop critical circuit pressure losses in the most common problem areas of the transmission.
Related Sonnax Parts
Required
Recommended
4R44E, 4R55E, 5R44E, 5R55E
Elevated Pressure Main Pressure Regulator Spring 56947-17
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Helps cure:
- Soft shifts
- Poor shift quality
- Low base line pressure