Wear at the pressure regulator bore, especially at the balance end, results inthe PR valve not being able to stroke to the lower line pressure position. This results in high line pressure. Leakage of line to exhaust reduces line rise. Slow line rise in response to engine load eventually burns a clutch or reduces TCC apply pressure.
Refurbish worn bores using the specially designed F series tool kit and the Sonnax VB- FIX and install the Sonnax oversized Pressure Regulator valve and boost valve assembly