Printpartsummary
Symptoms:
  • Burnt brake clutches
  • Burnt clutches
  • Delayed engagement
  • Inadequate lubrication
  • Low pressure
  • Slips & flares
  • Soft shifts
  • TCC apply & release concerns
  • TCC codes
Cause:

Loss of oil pressure due to worn components in critical oil circuits.

Correction:

Zip Kit seals critical pressure losses.

Video

55-50SN, 55-51SN

Zip Kit®

Part No.

AW55-50SN-ZIP

Zip Kit®
  • Zip Kit®

Small_aw55-50sn-zip

55-50SN, 55-51SN

Zip Kit®

Part No. AW55-50SN-ZIP

  • Solenoid Modulator Valve, Sleeve, Spacer Sleeve & Spring
  • O-Ringed End Plug Kit
  • Solenoid Relay Valve Kit
  • Pressure Regulator Valve, Balance Pin, Retaining Clip & O-Rings 2 O-Rings, 1 Extra
  • Boost Valve & Sleeve
  • Lockup Relay Control Valve Kit
  • B5 Control Spring
  • LPC Accumulator Piston Kit
  • Secondary Regulator Valve, Spring & Seals 2 Seals, 1 Extra
  • Lockup Control Valve Kit
  • Line Relief Spring Red
  • B4 Release & Reverse Inhibit Springs (2) No Color
  • TCC Check Valve Springs (2) 1 Yellow, 1 White
  • Cooler Bypass Spring Large, No Color

Also fits AF 23/33 and RE5F22A units.

Complaint:

  • Burnt brake clutches
  • Burnt clutches
  • Delayed engagement
  • Inadequate lubrication
  • Low pressure
  • Slips & flares
  • Soft shifts
  • TCC apply & release concerns
  • TCC codes

Cause:

Loss of oil pressure due to worn components in critical oil circuits.


Correction:

Zip Kit seals critical pressure losses.

Sonnax Zip Kit AW55-50SN-ZIP targets the root cause of multiple complaints by sealing the critical circuit pressure losses in Aisin AW 55-50/51SN valve bodies. The kit contains uniquely designed parts to prevent the loss of pressures within the main line, lockup, solenoid and throttle signal circuits. The kit also seals multiple circuits known to suffer from end plug leakage. No special tools are required for installing these parts.

The Zip Kit quick guide provides clear and easy instructions on one sheet to get the unit sealed up and back on the road fast. In addition to general rebuilding tips and technical information, the technical booklet included in this kit contains vacuum testing information and locations at other key areas of the valve body.

  • No reaming required
  • Installs quickly with no special tools required
  • Uniquely designed parts address root causes of valve body complaints by sealing critical pressure circuits
  • Detailed technical booklet included with in-depth rebuild and inspection tips for comprehensive valve body repair

In addition to general rebuilding tips and technical information, the technical booklet included in this kit contains vacuum testing and additional repair options for higher mileage units, or for repairing specific complaints which are beyond the scope of this kit.

Click on the unit names to view all recommended Sonnax repair options for these transmissions.

  • Patent No. 8,919,381

The Sonnax ZIP KIT®

The First Step in Correcting Common Shift Problems

It's easy to restore and extend vehicle shift quality with Zip Kits. Uniquely designed Sonnax parts target the root cause of valve body complaints and stop critical circuit pressure losses in the most common problem areas of the transmission.

Related Parts

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Valve Body Layouts

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

Valve Body Layout Aisin AW 55-50SN

Zip Kit® Video - The first step in correcting common shift problems.

It’s easy to restore and extend vehicle shift quality with Zip Kits. Uniquely designed parts target the root cause of valve body complaints and stop critical circuit pressure losses in the most common problem areas of the transmission. No reaming or special tools required to install simple, effective parts. Each kit comes with an in-depth tech booklet for installation, testing and diagnostics.

Learn more

Contact a Sonnax Distributor to purchase this part.