4L60E 4L65E Transmission TCC Regulator & Isolator Valve Kit Sonnax 77754-03K

Brand: Sonnax  Type: Valve Body Valve Kit Interchange Part Number: S74741QK Manufacturer Warranty: Yes Fitment Type: Direct Replacement Items Included: TCC Regulator & Isolator Valve Kit Manufacturer Part Number: 77754-03K Material: Aluminum Universal Fitment: Yes Vintage Part: No Performance Part: Yes 4L60-E Transmission Valve Body... TCC Regulator & Isolator Valve KitPart No. 77754-03K Fits '97-earlier Non-EC3 units only Tooling: F-77754-TL4 F-77754-SERV 77754-R2 77754-SERV 77754-RM5 VB-FIX In GM 4L60-E, 4L65-E and 4L70-E unit, severe wear of the TCC regulator valve bore is caused by oscillation of the OE valve allows regulated converter apply pressure to exhaust. This is a primary cause for TCC-related slip code P1870 and overheated converters. Exhausting apply pressure also diminishes line pressure, which can result in burnt clutches. Excess wear at the isolator valve bore reduces TCC apply pressure. Reconditioning the bore and installing Sonnax TCC regulator and iso