Sonnax 4L60 4L60E Transmission TCC Apply Valve Kit for PWM Units 1870 Code Apply Valve Kit for PWM Units OnlyFits PWM units only. Updated stroke pressure eliminates TCC drift on apply and updated exhaust control PTFE seal eliminates cross leaking of converter signal oil and converter feed oil Sonnax kit works in both early- and late-style PWM pumps when used with included spring