Description
4L80E / 4L85E 1-2 & 2-3 Shift Valve Spring Kit, Sonnax 34994-02K.
In 4th Gear, signal A oil force must overpower the 1-2 shift valve spring and opposing signal B pressure in GM 4L80-E and 4L85-E transmissions. Subsequently, if the 1-2 shift valve does not remain fully stroked, drive oil to second and direct will be cut off or go to exhaust. The reaction area of A is greater than that of B, so the spring is the stroking factor. Additionally, when AFL oil drops, and signal A becomes less than 58 psi, the 1-2 valve will stall or float.
Furthermore, this 3-1 or complaint of 3rd Neutral will occur in OD or D with scanner indication of 4th commanded. Sonnax 1-2 and 2-3 shift valve spring kit 34994-02K replaces the original 1-2 shift valve spring and 2-3 shift valve spring.
- Set allows salvage of stripped cores
- Restores signal pressure to shift solenoids
- Improves shift
Also, springs MUST be used together. This is not a fix for leaking solenoids or leaking seals in the solenoid signal or actuator feed limit circuits. See AFL valve repair 34200-16K.
- 1-2 Shift Valve Spring
- 2-3 Shift Valve Spring
