When internal sealing rings wear or harden, an automatic transmission loses the hydraulic pressure it needs to shift cleanly, and no amount of adjustment corrects that until the rings themselves are replaced. This set covers the C3 sealing ring application for A904, A998, and A999 units produced from 1968 through 1996, giving the rebuilder the correct rings for those three related transmission families under a single SKU.The rings are pulled and packed here at REMCO, where we have worked in automatic transmission parts since 1991. Each order goes out with a piece list inside the box so the technician can confirm what arrived before the unit goes on the bench. There are no substitutions or fillers: what the list says is what the box contains.This listing is sealing rings only. It does not cover friction clutch discs, steel reaction plates, the transmission filter, gaskets, or bands. If your rebuild needs those components, they are separate purchases. Reviewing your parts list against what this set includes before ordering saves time on both ends.At one pound shipped, the package is compact, but the fit of these rings to the A904, A998, and A999 bores is what determines whether the rebuilt unit holds pressure through every range. Confirm the transmission code stamped on your unit and that the production year falls inside the 1968-to-1996 window before placing the order. Restores internal pressure retention in A904, A998, and A999 automatic transmission units, addressing leakdown that causes shift problems and slipping. This listing covers sealing rings only. It does not include friction discs, steel plates, filter, gaskets, or bands. Confirm exactly what your rebuild requires before ordering. C3-line sealing rings selected for these specific transmission families, covering the full production span from 1968 through 1996 in a single part number. Individual sealing ring set for A904, A998, and A999 applications. Packaged with a piece list inside the box. Shipped weight: 1 lb. Before ordering, verify the transmission code on your unit matches A904, A998, or A999, and confirm the model year falls within the 1968-1996 range.