Severe wear of the TCC regulator bore allows regulated converter apply pressure to exhaust, while wear at the isolator valve bore reduces TCC apply pressure.
Sonnax TCC regulator valve kits restore hydraulic integrity to the bore and prevent side loading.
Severe wear of the TCC regulator valve bore from the OE valve allows regulated converter apply pressure to exhaust. This is a primary cause for a TCC-related 1870 slip code and overheated converters. Exhausting apply pressure also diminishes line pressure, which results in burnt clutches. Excessive wear at the isolator valve bore reduces TCC apply pressure. The Sonnax TCC regulator valve kit 77754-04K allows you to restore hydraulic integrity of the apply circuit.
Sleeve is manufactured from highly wear-resistant aluminum to provide full support for the valve and prevent side loading
Valves are hardcoat anodized to reduce wear and have annular grooves for better centering within the sleeve
Isolator valve has been lengthened to operate in unworn portions of the bore