When internal sealing rings wear or harden, fluid bypasses the circuits it should pressurize, and the transmission loses the apply force it needs to shift cleanly. This sealing ring set is built for A413, A404, and A670 automatic transmission units produced from 1980 onward, covering the 30TH family, and it addresses that specific failure point directly.
What sets this part apart is its scope: one set covers the ring positions across the A413, A404, and A670 platform, so a technician working any unit in that family does not need to source rings separately for each bore. The rings are measured and assembled at the REMCO facility. A printed list of contents ships inside the package so the bench count takes seconds.
This listing is for the sealing ring set only. It does not include friction discs, steel plates, Automatic Transmission Filter, gaskets, or band. If your overhaul requires those components, they are separate items. Review your parts breakdown before ordering to confirm what you still need.
Packaged weight is 1 lb. REMCO has been working in automatic transmission parts since 1991, and every set that ships goes through the same hand-assembly and verification process used across the entire line.
To avoid ordering the wrong part, confirm the transmission identification code on your unit, the production year, and that your application falls within the 1980-and-up coverage before completing the purchase.