TCS Dodge A618/47RE/48RE Transmission Rear Clutch Retainer 48RE Rear Clutch Retainer (Forward Clutch) This Rear Clutch Retainer is manufactured from 4140 HTSR billet steel vs. the O.E. cast part. The O.E. cast Retainer is known to fail, (see photo below) therefore, this TCS high strength Rear Clutch Retainer should be considered when using for commercial, heavy duty and in certain raised line pressure applications. Will also interchange with A727, 47RH/RE units. This Heavy Duty A518/618 4.2 ratio band lever is one of the most sought after upgrades!