Join Date: Sep 1999
Location: Vancouver, Washingon
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Re: 700r4 torque converter lockup circuit
I am thinking that most GM brakes switches are either two prong or four prong. Usually the four prong switch is used with vehicles equipped with cruise control and/or lock-up torque converter. My 82 GMC with both cruise control and turbo 350C uses a four prong brake light switch. Two of the prongs are used for the brake lights, while the other two prongs are wired to release the cruise control and/or lockup clutch when the brakes are applied. Most any GM vehicles built after 1984 had a lock-up torque converter. It might be worth while to wire the 700R4 torque converter to lock-up when in high gear only.