Symptoms:
- Burnt bands
- No Reverse
- Rear servo piston sticking/breakage
Cause:
Piston cocking in bore and pin bore wear inhibits band apply.Correction:
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 DistributorThe 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" |
Related Sonnax Parts
Required
Recommended
46RE, 46RH, A727
Rear Servo Piston 22912
-
Helps cure:
- Burnt bands
- No Reverse
- Rear servo piston sticking/breakage
Required
Recommended
47RE, 48RE
Rear Servo Piston 22912C
Fits '97-later units.
-
Helps cure:
- Burnt bands
- No Reverse
- Rear servo piston sticking/breakage
Required
Recommended
Required
Recommended
46RE, 46RH, 47RE, 47RH
The Sure Cure® Kit SC-46-47RHE-OS
-
Helps cure:
- 2-3 Late
- 2-3 Oversensitive
- Build up of release pressure during lockup
- Converter bushing failure
- Delayed engagement
- Lockup shudder
- Low cooler flow
- Lube failures
- Overheated converter
- Poor cooler charge at idle
- Poor Forward & Reverse engagement
- Poor kickdown
- Poor line pressure control
- PR valve buzz
- Reverse slip
- Shift timing concerns
- Soft TCC apply