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  • Delayed engagement
  • Excess heat
  • Flare shifts & bind-ups
  • Harsh engagement
  • Harsh shifts
  • Slipping gears
  • TCC apply & release concerns
  • Soft shifts


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


Zip Kit seals critical pressure losses and restores and extends accumulator action.


Zip Kit®
Part No. 6R140-ZIP

View Instructions

Sonnax Zip Kit 6R140-ZIP targets the root cause of multiple complaints by sealing the critical circuit pressure losses in Ford 6R140 valve bodies. The kit contains uniquely designed parts to prevent the loss of pressures within the main line, solenoid regulator, reverse, clutch control, TCC and solenoid apply circuits with no special tools required.

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 and additional repair options for higher mileage units or for repairing specific complaints which are beyond the scope of this kit.

  • 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
  • TCC Apply Boost Valve Kit
  • O-Ringed End Plug Kit
  • Internal O-Ringed End Plug Kit
  • Accumulator Pistons (3)
  • Converter Limit Valve, Sleeve & Spring
  • Accumulator Springs (3)

April 21, 2015

Adapt & Overcome

Brian Wing

Topics: Rebuilding Tips Shop Practices Diagnostics And Theory Transmission Aisin AW 55-51SN Transmission 55-50SN Transmission

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March 09, 2016

Transmission Report: U341E/F TCC Slip Diagnosis

Topics: Transmission Report Newsletters Transmission Toyota/Lexus U341F Transmission U341E Transmission

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September 30, 2005

Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits

Gregg Nader

Topics: Diagnostics And Theory Transmission

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  • 6r140 zip family

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.

Learn More About Sonnax Zip Kits