• Flare shifts
  • Harsh shifts
  • Soft shifts
  • Pressure loss
  • Burnt clutches


Damaged, deformed and/or eroded end plugs and bores allow loss of critical hydraulic pressure.


Recover hydraulic control and renew critical circuit pressures by installing Sonnax drop-in internal O-ringed end plug kit.


Internal O-Ringed End Plug Kit
Part No. 126740-05K

You need this if... View Instructions Find a Distributor

OE end plugs are designed to prevent critical pressure loss by capping the bore, while also functioning as a spring or valve stop. Repetitive spring motion, valve impact and fluid pressure variations cause wear between the end plug and bore mating surface, allowing vital fluid to escape the circuit.

Ford 6R140 valve bodies have end plugs at the various clutch latch valve bores and the solenoid feed pressure regulator valve bore that are susceptible to this wear. When pressure drops due to plug deterioration, various shift concerns can arise and burnt clutches will result in the affected circuit. Prevent leaks and restore hydraulic integrity and normal shift operation by installing Sonnax internal O-ringed end plug kit 126740-05K.

  • Minimal end-plug-to-bore clearance with added O-ring for positive seal
  • Drop-in Zip Valve parts install quickly and easily
Learn More About Zip Valve™ Drop-In Repairs
  • End Plugs (6)
  • O-Rings (10) 4 Extra

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.

Ford 6R140 Valve Body Layout

Ford 6R140 Valve Body Layout
  • 6R140 Internal O-Ringed End Plug Kit 126740-05K
  • 6R140 Internal O-Ringed End Plug Kit 126740-05K

You need this if...

End plug deterioration or bore wear is visually detected.