When the diagnosis points to a single failed sealing ring in a TH400 or 3L80 automatic transmission, ordering a full overhaul kit means paying for components you do not need. This listing covers one sealing ring unit selected for the TH400 and 3L80 family, a hydraulic-circuit component that maintains internal pressure by sealing ring grooves on shafts and pistons inside the unit.
The TH400, also catalogued as the 3L80, has been in continuous service since 1965, and this part covers that entire production run from 1965 forward. A worn or cracked sealing ring in this automatic transmission typically shows up as delayed engagement, pressure loss in a specific circuit, or a slip condition that does not respond to band or clutch adjustment. Replacing the ring alone, once the source has been confirmed, avoids unnecessary disassembly of unrelated circuits.
At REMCO, parts are not shipped from a prepackaged bulk box. Each order is filled individually, and the packing includes a parts list so the technician can verify on arrival that the correct piece is in hand. REMCO has worked in automatic transmission parts since 1991, and the TH400 line has been part of that catalog throughout.
Before ordering, pull the transmission identification and confirm the code reads TH400 or 3L80. Also verify the vehicle production year falls within the 1965-and-up application. If your unit carries a different code or a date outside that window, this ring is not the correct part. The listing does not include gaskets, clutch discs, steels, Automatic Transmission Filter, or band: only the sealing ring described here.
- Sealing ring designed for TH400 and 3L80 automatic transmission units, covering production from 1965 forward to keep internal hydraulic circuits sealed and pressures stable.
- This listing covers a sealing ring only. It does not include clutch packs, steels, gaskets, Automatic Transmission Filter, or any other component. Verify what else your rebuild requires before ordering.
- A single sealing ring may be exactly what a targeted repair needs: replacing one worn or broken ring without purchasing a full overhaul set reduces parts cost on precision diagnostics.
- One sealing ring unit, 1 lb shipped weight. Pulled from REMCO inventory that has been organized and verified since 1991 specifically for automatic transmission components.
- Before ordering, confirm the transmission code on your unit matches TH400 or 3L80 and that the production year falls within the 1965-and-up application range.
What's in the box
- 1 x Ring Kit, TH400
Compatible vehicles
- Fits K2500 Panel Delivery 3/4 Ton 4WD [67].
| RING KIT TH400 |
Default Title |
|---|
