Sonnax Number 6F50-ZIP, Zip-Kit for Ford 6F50 and 6F55 Transmissions

$ 264.00


  • Burnt clutches
  • Line pressure instability
  • Loss of fuel economy
  • No line rise
  • Pressure loss
  • Shift concerns
  • TCC apply & release concerns
  • TCC codes


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


Recover hydraulic control and restore normal shift operation by installing Sonnax Zip Kit.

SKU: SX 6F50-ZIP Categories: , Tags: ,


Sonnax Number 6F50-ZIP, Zip-Kit for Ford 6F50 and 6F55 Transmissions

Fast, safe and effective shift repairs are EASY with Sonnax Zip Kits.

  • No reaming or special tools required
  • Stops hydraulic leaks
  • Extends the life of high-mileage units
  • Includes in-depth tech booklet with diagnostic tips, installation steps, plus additional fixes for other worn areas in the valve body

Sonnax Zip Kit 6F50-ZIP targets the root cause of multiple concerns by sealing critical circuit pressure losses in the Ford 6F50 and 6F55 valve bodies. The kit contains uniquely designed parts to prevent the loss of pressures within the main line, clutch apply control, solenoid feed 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.

  • O-Ringed End Plug Kit
  • Isolator Valve Kit
  • Checkballs (7) .250″ Dia., 1 extra
  • TCC Regulator Valve, Spring, Shuttle Valve, End Plug & O-Rings 2 O-Rings, 1 extra
  • AFL Valve, Sleeve, Spring & Clip
  • Aluminum Plugs (2) 1 Extra, (not shown)
  • Drill Bit .062″ Dia., (not shown)


Additional information

Weight 2 lbs
Dimensions 4 × 4 × 3 in