Symptoms:

  • Premature clutch failure
  • Premature band failure
  • Erratic buzz
  • Uncontrolled pressure in Reverse
  • Low line rise
  • Low Reverse boost
  • Soft shifts

Cause:

An out-of-position accumulator shift valve creates soft or flared upshifts.

Correction:

Updated design of the drop-in Sonnax accumulator shift valve kit eliminates the OE split valves and seals all circuits.

4F20E, RE4F04A

Accumulator Shift Valve Kit
Part No. 63940-03K

View Instructions Find a Distributor

In Ford 4F20E and Jatco/Nissan RE4F02E units, the accumulator shift valve lineup has been changed numerous times by OE and incorrect reassembly can result in soft or flared upshifts. Sonnax accumulator shift valve kit 63940-03K includes an accumulator shift valve that will be correctly positioned to prevent soft or flared upshifts.

  • Shift valve provides proper circuit flow to prevent soft or flared upshifts
  • Replaces all OE lineups that use an accumulator shift valve
  • Drop-in Zip Valve parts install quickly and easily
Learn More About Zip Valve™ Drop-In Repairs

Replaces early or late OE lineups in most valve bodies. Some late valve bodies do not have an accumulator shift valve.

  • Valve
  • Spring
  • O-Ring
  • 4F20E, RE4F04A Accumulator Shift Valve Kit 63940-03K
  • 4F20E, RE4F04A Accumulator Shift Valve Kit 63940-03K