• Burnt bands
  • No Reverse
  • Rear servo piston sticking/breakage


Piston cocking in bore and pin bore wear inhibits band apply.


Restore normal servo operation by installing Sonnax rear servo piston.

47RE, 47RH

Rear Servo Piston
Part No. 22912B

Fits '94–'96 units.

OE Part No. 4531229

Find a Distributor

The rear servo piston in Chrysler 47RH/RE '94–'96 units can get wedged in the bore, causing bind in Reverse. Intermittent binding leads to bore wear and band damage. The improved design and material of Sonnax rear servo piston 22912B eliminates these concerns for consistent rear band apply.

  • Verify OE piston by referring to image shown here.
  • Modified seal ridges prevent piston from sticking in case bore
  • Billet aluminum won’t crack like OE cast piston
  • 2.460" O.D. piston
Part No. Application OE Part No. O.D.
22912C 47RE, 48RE '97-Later 52118745 2.46"
22912B 47RE/RH '94–'96* 4531229 2.46"
22912 46RE/RH, A727 2801281 2.80"
  • 47RE, 47RH Rear Servo Piston 22912B
  • 47RE, 47RH Rear Servo Piston 22912B details