Sonnax 46RE/46RH/47RE/47RH/48RE transmission piston retainer kit. Symptoms: Loss of lubrication oil to planetaries, reverse drum, retainer & planet failure. Cause: Excessive clearance between the overdrive piston retainer and intermediate shaft reduces lube flow to the gear train. Correction: Seal compensates for variations in case I.D. Oil is delivered to maximum loadpoints on shaft. Optional oversized reverse drum journal allows salvage of reverse drum.