i've heard of using a manual lockup switch for the TC on a 700. what does it accualy do? disable lockup? lockup in any gear? the new tranny i got from bowtie overdrive locks up as soon as it hits 4th gear. i always thought they are supposed to only lock up with light throttle, and unlock as you step on the gas, before it downshifts into third. my old tranny's lockup with burned out. anyhow, its a pig once its hits overdrive.its great for high speed freeway driving, but otherwise sucks. so what the deal with this switch?