5R55S Overhaul Kit 2005-10, new and ready to install. Fits the 5R55S. Ships fast from the USA.
A 2005-2010 Mustang V6 that flares between gears, or a 2005-2010 Explorer, Explorer Sport Trac or Mountaineer that takes a second or two to grab Drive, usually ends with the 5R55S on the bench. This is the Transtec 46002C overhaul kit for that rebuild. It is the gasket and seal package: case and pan gaskets, lip seals, shaft sealing rings and O-rings. It is supplied without pistons, so plan on reusing your original bonded pistons if the rubber is intact, or sourcing new ones if they are cracked or swollen. Frictions, steels, bands and a filter are not part of an overhaul kit.
By 2005 the 5R55S was a fully adaptive unit. The solenoid body sends regulated oil from its variable force solenoids to each clutch and servo, and the PCM watches shift times and adjusts pressure to keep them consistent. Leaking seals do not show up right away because the computer quietly compensates. Once the leak is larger than the adaptive range, the shift times stretch and the unit slips or sets a ratio code. Replacing every seal in the kit takes the leakage out of the equation, so the pressure the solenoids command is the pressure the clutch actually gets.
The S version uses the 38-tooth overdrive sun gear, per Sonnax, which is one of the hard-part differences from the W. Seals and gaskets are shared, which is why this kit is listed for both.
Rule out the cheaper and the non-seal causes first. Sonnax notes that vehicles built before May 2005 were factory filled with an early Mercon V that could degrade the solenoid, and Ford later revised the fluid; leftover old fluid can shorten a new solenoid's life. Servo pin bore wear in the case is a separate failure that new seals will not fix. Our 5R55S Mustang slipping guide and the 5R55 harsh or delayed shifts walkthrough help sort a solenoid pack or case problem from tired seals. If testing points at the solenoids, the 9L2Z-7G391-AA solenoid block pack fits these years.
This page covers the 2005-2010 5R55S. The 46002C is listed for the 5R55S from 2002 to 2010, the 5R55W from 2002 to 2004 and the 5R55N from 2000 to 2002. Vehicles named on the listing in this window include the 2005-2010 Ford Mustang, 2005-2010 Ford Explorer and Mercury Mountaineer, and the 2007-2010 Explorer Sport Trac. Some later V8 Explorers and Mountaineers did not use the 5R55S at all, so check your door-jamb transmission code or send us the year and VIN before ordering. All of our 5R55 parts are on the 5R55 collection page.
| Fits | 5R55S 2005-10 |
| Part type | Overhaul Kit |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
The 46002C is listed for the 2005-2010 Ford Mustang with the 5R55S. Confirm the transmission code on the door-jamb sticker matches before you order, or send us the VIN.
This version of the kit leaves out the bonded clutch pistons. If your pistons are not torn or swollen they can be reused. If they are damaged, order replacements before you start.
The listing covers the 5R55S, 5R55W and 5R55N only. Some V8 Explorers and Mountaineers used a different transmission, so check the transmission code before ordering.
Use the current Mercon V. Flush out any old fluid completely, since Sonnax ties the early factory fill used before May 2005 to solenoid problems in this family.
Frictions, steels and the filter at minimum. Inspect the servo pin bores, the pump and the bushings, and run an adaptive relearn after the install.
