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 shift valve eliminates the OE split valves and seals all circuits.4F20E, RE4F04A
Accumulator Shift Valve Kit
Part No. 63940-03K
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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 lineups that use an accumulator shift valve
- Drop-in Zip Valve™ parts install quickly and easily
Replaces early or late OE lineups in most valve bodies. Some late valve bodies do not have an accumulator shift valve.
- Valve
- O-Ring
- Spring
