Does anyone know anything about this Bolt in overdrive? Ive seen a little on it(including on TRUCKS TV) it seems to bee the thing to do if your trans dosent have a overdrive. Also does it actually make a shift? They say its like adding a extra gear to every gear. Ohh yea and does it work in 4wd? on trucks they said its even good for rockcrawling or somthen like that.