47RH / 47RE / 48RE Performance Rear Band Servo
618. 47RH / 47RE / 48RE Performance Rear Band Servo with Pin. Fits 47RH / 47RE / 48RE diesel transmissions only. (WILL NOT FIT EARLY 618 TRANSMISSIONS) Many Dodge 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 and there is insufficient force to apply the band in a direct line. 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.