1st-2nd & 2nd-3rd Shift Valve Spring Kit Sonnax 4L80E 4L85E

Sonnax 1-2 & 2-3 Shift Valve Spring Kit for 4L80-E, 4L85-E In GM 4L80-E and 4L85-E transmissions, proper 4th gear operation relies on signal A oil force overpowering the 1-2 shift valve spring and signal B pressure. If the 1-2 shift valve doesn't fully stroke, drive oil to the second and direct will be compromised, leading to issues such as 2nd gear starts, neutral after 2-3 shift, or no 4th gear. These problems are often compounded by worn AFL limit bores, leaking O-rings, and solenoids. Sonnax 1-2 and 2-3 shift valve spring kit 34994-02K replaces the original springs to restore proper signal pressure and improve shifting. Benefits: Allows salvage of stripped cores Restores signal pressure to shift solenoids Improves shift performance Note: Springs must be used together. This kit does not fix leaking solenoids or seals in the solenoid signal or actuator feed limit circuits. For AFL valve repair, see kit 34200-16K. Kit Contents: 1-2 Shift Valve Spring 2-3 Shift Valve Spring Sym