Many Chrysler ’97-later 47RE and 48RE transmissions experience rear servo piston sticking/breakage, pin bore wear and Reverse band slippage. The servo piston has a tendency to get cocked in the bore, inhibiting band apply. The high reverse line pressure continues to apply against a cocked piston, causing piston breakage. The bore of the piston also wears from side loading, resulting in insufficient band apply pressure. Sonnax offers rear servo piston 22912C to address these problems.

• 2.46″ O.D.
• Sonnax billet piston resists breakage better than the OE cast pistons
• Seal ridges on the piston are rounded to prevent the piston from sticking in the case bore
• The lower piston seal ridge is slightly smaller to prevent sticking