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Modified Item: No

Country/Region of Manufacture: United States

Custom Bundle: No

Surface Finish: Light oil to prevent corrosion

Manufacturer Part Number: 22912C

Other Part Number: 22912B 52118745

Brand: Sonnax

Fitment Type: Direct Replacement

Non-Domestic Product: No

Transmission Type: Automatic

Manufacturer Warranty: Unspecified Length

Dodge Ram Cummins Diesel A618 47RE 48RE
Billet Reverse Super Servo Upgrade
Fits 1997-up

Symptoms this piston addresses:

  • 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.

The rear servo piston in Chrysler 47RE and 48RE '97-later 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 22912C eliminates these concerns for consistent rear band apply.

  • Verify OE piston by referring to image shown
  • Modified seal ridges prevent piston from sticking in case bore
  • Billet aluminum won’t crack like OE cast piston
  • 2.460" O.D. piston

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