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


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


Zip Kit seals critical pressure losses. Drop-in parts install quickly and easily.

U660E, U660F

Zip Kit®
Part No. U660E-ZIP

View Instructions Find a Distributor

Sonnax Zip Kit U660E-ZIP targets the root cause of multiple complaints by sealing the critical circuit pressure losses in the Toyota/Lexus U660E and U660F valve bodies. The kit contains uniquely designed parts to prevent the loss of pressures within the main line, clutch apply control and lockup control circuits. The kit also seals multiple circuits known to suffer from end plug leakage or poor checkball sealing. 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.

  • Drop-in Zip Valve parts install quickly and easily, no reaming or 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
Learn More About Zip Valve™ Drop-In Repairs
  • B1 Apply Boost Valve Kit
  • Reverse Boost Valve Kit
  • O-Ringed End Plug Kit
  • Solenoid Modulator Drill Bit .062" dia., Not Shown
  • Solenoid Modulator Orifice Plugs (2) 1 Extra, Not Shown
  • Rivets (3) 2 Extra
  • Lockup Control Boost Valve Kit
  • C1 Accumulator Piston Kit
  • B1, B2, B3 & C2 Accumulator Piston Kit
  • Checkballs (3) Viton®
  • Case Connector O-Ring
  • Fluid Temperature Sensor O-Ring
  • Solenoid Modulator Valve, Sleeve, Selective Shims, Spring & End Plug

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.

Toyota/Lexus U660E/F, U760E/F Valve Body Layout

Toyota/Lexus U660E/F, U760E/F Valve Body Layout

  • U660E, U660F Zip Kit® U660E-ZIP


Zip Kit® Video - The First Step in Correcting Common Shift Problems

Installed this kit on my 2007 Camry 3.5L. Although it has 158,000 miles it runs great! Obviously shift feel has always been an issue with this trans and this kit does the job. I also like the fact that it doesn't require drilling in the VB castings. No improvement required to this kit. Keep up the great work!

G. Tamura
The Converter Factory
Sonnax Zip Kit

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, drop-in 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