Sonnax oversized piston retainer kit 12962N-02K allows rebuilders to salvage the expensive reverse drum. The oversized piston retainer requires only turning the I.D. of the drum using a lathe and then installing as normal.
Can be used in hydraulic or electonicly governed units
O-Ring prevents loss of lube oil. Many OE supports do not seal well in this area
Two O.D. oil delivery grooves have been repositioned at high-load areas
Two I.D. oil delivery grooves run full length of load-bearing surface
Band drum diameter (standard and oversized) allows drum I.D. to be turned