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