Power Switch For TH700R4 & TH200R4Power switch For GM Clutch Converters, 1981 to 1991 Application: 1981 to 1989 GM TH 700R4 1981 to 1991 TH 2004R, 200C and 350C Operate your vehicle as a standard type torque converter when it is more desirable than the lock up type. The Power switch kit supplied for these transmissions only locks out the converter clutch in first through third gear. The TH700 R4 and the TH2004R will not function properly with the lock up converter locked out in fourth