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:

This updated design eliminates the OEM split valves and seals all circuits.

4F20E, RE4F04A

Accumulator Shift Valve Kit
Part No. 63940-03K

View Instructions Find a Distributor

The accumulator shift valve line-up has been changed numerous times by OE, and incorrect reassembly can result in soft or flared upshifts. This kit 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.
  • Sonnax design replaces all OE line-ups that use an accumulator shift valve.

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

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