When sealing rings wear, the automatic transmission loses the hydraulic pressure it needs to engage clutch packs cleanly, and the result shows up as slip, soft shifts, or delayed engagement that gets worse over time. This set of 8 sealing rings addresses that root cause directly, covering three related units, the 5R55W, 5R55S, and 5R55N, with rings that have been chosen by material type to match where each one sits in the valve body and drum circuit.
The set breaks down as follows: 2 Peek-Metal rings, 3 Teflon rings, and 1 Quantum ring. Each material type handles different temperature and pressure conditions inside the unit, which is why a single-material solution rarely works as well as a mixed set. Peek-Metal rings hold dimensional stability under high cycling loads. Teflon rings conform to the bore and seat without scoring the housing. The Quantum ring is designed for the specific circuit where standard Teflon would not hold long enough.
This is not a full rebuild kit. It contains sealing rings and nothing else. There are no frictions, no steels, no Automatic Transmission Filter, no gasket set, and no band. If your job requires those parts, they need to be sourced separately. The listing exists to serve rebuilders who already have most of the unit covered and need the sealing ring portion filled in correctly.
REMCO has been working in automatic transmission parts since 1991. Every set is assembled here, ring by ring, and checked against a parts list before the box is sealed. That list ships inside the box so the technician can verify the count on the bench before the unit goes back together.
Applies to 5R55W, 5R55S, and 5R55N transmissions, 1999 and up. Confirm the code on the unit tag and the model year before ordering. Weight is 1 lb.
- Restores internal sealing integrity across three closely related transmission families, addressing pressure loss caused by worn or cracked sealing rings.
- This listing covers sealing rings only. It does not include friction discs, steel plates, Automatic Transmission Filter, gaskets, or any other soft parts. Verify your full parts need before ordering.
- Eight rings in a single set, with materials matched to their position: 2 Peek-Metal rings, 3 Teflon rings, and 1 Quantum ring, each selected for the demands of that circuit.
- Set contains 8 sealing rings total: 2 Peek-Metal, 3 Teflon, 1 Quantum. Weight: 1 lb. A packing list is included in the box so you can verify every piece on arrival.
- Before ordering, confirm the exact transmission code on the unit tag, the model year, and which variant you have: 5R55W, 5R55S, or 5R55N. All three are covered, but the codes are not interchangeable.
What's in the box
- 1 x Ring Kit, Sealing Kits
Compatible vehicles
- Fits Mustang [05-10], Thunderbird [02-05], Explorer [02-10], Explorer Sport Trac [05-10], S-Type [00-02], XK8 [01-02], XKR [00-02], Aviator [03-05], LS [00-06], Mountaineer [99-01].
| Ring Kit 8-Rings (2-Peek 2-Metal 3-Teflon 1-Quantum) 1999-Up 5R55N SW |
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