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Manufacturer Part Number: 56361J-01K

Other Part Number: S46761A-2K

Brand: Sonnax

5R55N, 5R55S, 5R55W

Overdrive & Intermediate Servo Pin Bore Sleeve Kit
Part No. 56361J-01K

  • S-56361J-TL
Servo apply oil is fed through the center of the case bridge and into the servo pin, reacting on the cover side of the piston. As the case pin bore wears, this apply oil will leak into the barrel area of the case. This negatively affects shift timing and servo/band apply pressure. Servo release pressure is fed through the case and into the spring side of the piston. As pin bore wear increases, release oil will cross leak into the apply circuits, exhausting at the shift valves. In reverse, both servos are charged from the release side, so pin bore wear results in delayed reverse. The 5R55N, 5R55W and 5R55S are prone to foaming the fluid in the sump from excess exhaust and valve body wear. This results in fluid out the vent and improper fill indications.
  • Highly wear-resistant aluminum sleeve extends case life
  • Sleeves repair 5R55N, 5R55W and 5R55S overdrive and intermediate servo locations
  • One tool kit fits 5R55N, 5R55W and 5R55S overdrive and intermediate servo locations
  • Tool kit pilot and reamer align from the pin bore centerline, not the servo piston bore
  • Allows expensive case salvage
  • Overdrive Repair Sleeve
  • Intermediate Repair Sleeve


  • 1-2, 2-3, 4-5 Flares
  • Gear loss
  • Code 732, 733,735
  • Band lining failure
  • Loss of OD & intermediate servo control


Severe wear of the case at the servo apply pin bore due to continuous pin oscillation can result in burned clutches, shift complaints, and destroyed cases.


The Sonnax sleeve is made from highly wear-resistant aluminum, and allows the case to be refurbished to provide proper clearance with the servo apply pins.

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