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The SON-258761-01K is a heavy duty Powerglide reverse piston machined from 6061 billet aluminum and supplied by Sonnax. This piston is designed and machined as what we would consider a tall piston, measuring 1.150” tall. In its as supplied state, it is designed to be used with a clutch pack that contains four-friction disk and five steels. The piston can be machined to suit a clutch pack with five to six clutch disks. Sonnax supplies this piston with a new inner and outer sealing ring.
