Sonnax Zip Kit for 4R44E, 4R55E, 5R44E, 5R55E
The Sonnax Zip Kit 4R44E-5R55E-ZIP addresses the root causes of valve body complaints in Ford 4R44E, 4R55E, 5R44E, and 5R55E transmissions. This kit seals critical circuit pressure losses in the main line, EPC, solenoid feed, and converter circuits. Additionally, it includes modifications to enhance shift firmness, improve intermediate servo and direct clutch pressure, and optimize TCC apply. The kit also resolves end plug leakage and poor checkball sealing issues, all without requiring special tools.
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Effortless Installation: Drop-in Zip Valve™ parts install easily with no reaming or special tools required.
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Targeted Repairs: Uniquely designed components address root causes of valve body pressure issues.
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Comprehensive Guidance: Includes a quick guide for fast installation and a technical booklet with rebuild tips and repair options for higher mileage units.
Contents:
- Forward Modulator Valve, PTFE Seal, End Plug, Spring, & Large O-Ring
- Boost Valve & Sleeve Kit
- Reverse Modulator End Plug & 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”, .062”, .072” & .110” dia.
- Aluminum Plug, .062”
- Rivets (3) 2 Extra
- Shift Solenoid O-Rings (8) 4 Small, 4 Large
- 2-3/3-4 Shift Valve End Plug & 2 Small O-Rings
- 1-2/2-3 Shift Valve End Plug & 2 Medium O-Rings
- Converter Regulator Valve End Plug, Spring, & 2 Large O-Rings
Symptoms Addressed:
- Gear ratio and solenoid codes
- Low line rise
- Soft shifts
- Erratic shifts
- No 3rd or 4th gear when hot
- 2nd gear starts
- Delayed forward engagement
- TCC apply concerns
Cause: Loss of oil pressure caused by worn components in critical oil circuits. Correction: The Sonnax Zip Kit restores hydraulic integrity by sealing pressure losses. Drop-in parts ensure quick and easy installation.
Transmissions: 5R44E 1997-UP, 4R44E 1995-UP, 4R55E 1995-UP, 5R55E 1997-UP
Vehicle
FORD
AEROSTAR 1996-1997 4 SP RWD V6 3.0L 4.0L
RANGER 1995-2001 4 SP R/4WD L4 2.3L 2.5L V6 3.0L 4.0L
EXPLORER 1995-1996 4 SP R/4WD V6 4.0L
AEROSTAR 1997 5 SP R/4WD V6 4.0L
EXPLORER/SPORT TRAC 1997-2008 5 SP R/4WD V6 4.0L
RANGER 1997-2011 5 SP R/4WD L4 2.3L V6 3.0L 4.0L
MAZDA
PICKUP B SERIES 1997-2010 5 SP R/4WD L4 2.3L 2.5L V6 3.0L V6 4.0L
PICKUP B SERIES 1995-2002 4 SP R/4WD L4 2.3L 2.5L V6 3.0L
MERCURY
MOUNTAINEER 1998-2000 4 SP R/4WD V6 4.0L
Alternate Words: Automatic Transmission, Reprogramming, Improvement , Correction, Shift , Valve Body Rebuild Kit, 4R44E-5R55E-ZIP, 4R44E5R55EZIP