Sonnax 72854-03K TCC Regulator Valve Kit for GM 4T80-E Transmissions

The Sonnax 72854-03K TCC regulator valve kit provides enhanced valve support during oscillation and restores hydraulic integrity in GM 4T80-E automatic transmissions. This comprehensive repair solution addresses common torque converter clutch (TCC) problems caused by valve bore wear in the upper control valve body.

Addresses Critical Transmission Problems:

• Repairs bore wear caused by continuous oscillation of the converter regulator valve in cast-aluminum bores, which allows apply oil to leak to exhaust
• Eliminates end plug wiggling and wear that results in balance regulated apply oil leaking to exhaust, which can prevent converter clutch engagement and set diagnostic codes
• Restores proper TCC apply and release function
• Prevents converter clutch slippage and overheating

Complete Kit Includes:

• Sleeve, valve, three springs (1.000" plain, 1.670" white, 1.875" plain), washer, end plug, and O-ring
• Hardcoat anodized aluminum valve for enhanced durability
• Multiple spring options for different TCC apply characteristics

Installation Notes:

Requires reamer tool kit 72854-TL2 and Sonnax VB-FIX self-aligning valve body reaming fixture for proper bore reconditioning (sold separately). This kit is designed for professional transmission rebuilders and requires precision machining of the valve body bore for proper installation.

Reconditioning the bore and installing this TCC regulator valve kit restores hydraulic integrity to the transmission's torque converter clutch control system, eliminating oil pressure loss and ensuring reliable converter clutch operation.