TCC Regulator Valve Kit Sonnax 4L80E 4L85E

Sonnax TCC Regulator Valve Kit for 4L80E and 4L85E Transmissions GM vehicles equipped with 4L80-E and 4L85-E transmissions may experience issues such as TCC shudder, burnt converter linings, TCC apply and release problems, and associated error codes. These issues are often due to significant pressure loss caused by excessive wear in the TCC regulator bore. The Sonnax TCC Regulator Valve Kit (part number 34994-01K) is designed to restore the hydraulic integrity of the TCC control circuit, ensuring reliable TCC operation. Key Features: Constructed from hardcoat anodized aluminum to resist premature wear. Extended critical spool length enhances stability and minimizes wear. Annular grooves help center the valve in the bore, reducing future side-load wear. Added chamfer improves apply characteristics and prevents shudder. Includes two springs: one for an OEM lockup feel, and another for a firmer-than-OE response. Quick and easy installation with drop-in Zip Valve™ components. Kit Content