AOD AODE 4R70W 4R75W transmissoin Sonnax spiral retaining ring kit works in roller clutch or mechanical diode applications.vehicles equipped with 4R70W/4R75W and AOD/AODE transmissions often experience failure of the intermediate roller clutch or mechanical diode during high-rpm conditions. Sonnax spiral retaining ring kit 76554RK incorporates a spiral snap ring that is staked to a locking ring to ensure ring contact with groove during high-rpm conditions, eliminating blowout.Wrap-around design maintains contact with groove bottom locking ring prevents spiral retaining ring expansion during high RPM