A single failed sealing ring on a JR403E automatic transmission can cause enough internal fluid bypass to produce soft shifts, delayed engagement, or a complete loss of a gear range, and this listing covers exactly the ring needed to address that failure point. The part is catalogued under RE4R01A and is intended for JR403E units produced between 1989 and 1998, no other unit families are covered here.This is not a kit and it is not a multi-piece set. The order contains one sealing ring, nothing more. If your job also calls for friction discs, steel plates, a filter, a gasket set, or a band, those are separate purchases. Knowing this before you order avoids a return trip and keeps the repair on schedule.At REMCO, parts are assembled into each order by hand, checked against the item list, and packed with that list inside the box so the receiving technician can verify the contents on the spot. The company has worked exclusively in automatic transmission parts since 1991, and the RE4R01A catalog reference used for this ring reflects the same part numbering the shop floor already knows.Weight is 1 lb. Before placing the order, pull the transmission code directly from the unit, not from the vehicle VIN or a general lookup, and confirm it reads JR403E. Also verify the build year sits between 1989 and 1998. If either data point does not match, this ring is not the correct part for that job. Replacing a worn or cracked sealing ring on a JR403E unit stops internal pressure loss and prevents erratic shift behavior caused by fluid bypass. This listing covers a single sealing ring only. It does not include friction discs, steel plates, filter, gaskets, band, or any other components. Verify your exact need before ordering. The sealing ring is selected to match the JR403E and RE4R01A specifications, making it a direct drop-in for the targeted circuit without modification. Contents: 1 sealing ring. Application: JR403E transmission, RE4R01A catalog reference. Item weight: 1 lb. Before ordering, confirm your transmission code matches JR403E or RE4R01A and that the build year falls within the 1989-1998 range. A wrong code means a wrong fit.