When the inner teflon ring at the second apply piston loses its seal, hydraulic pressure bleeds past the bore and the transmission struggles to build a clean 1-2 shift. This single ring, sized at 2.321 in. for the inner position, addresses that specific failure point in TH700, 4L60, 4L60E, and 4L65E automatic transmission units built from 1982 through 2013.

Teflon is the correct material for this location. Unlike rubber rings that crack or extrude after repeated heat cycles, teflon holds its cross-section and maintains consistent contact with the bore wall across a wide temperature range. That matters here because the second apply piston operates every time the unit shifts into second gear, meaning this ring sees thousands of pressure pulses over the life of the transmission.

This is the inner ring only. If your diagnosis points to the outer position, or if you need additional sealing rings elsewhere in the unit, those are separate items. Check your inspection notes against the position and diameter before placing the order.

The part covers a long production run, but transmission codes and assembly dates can overlap or vary by application. Confirm that the identification stamped or tagged on the actual unit reads TH700, 4L60, 4L60E, or 4L65E, and that the model year is within the 1982-2013 range. REMCO has been working in automatic transmissions since 1991, and every item ships with a part list so you can verify what you received against what was ordered.

What's in the box

Compatible vehicles