bought a project truck that has a built 350 and th400. transmission never really worked right, slow to shift, but it did shift. now it won't shift outta 1st at all. the vacuum line was loose and leaking so i rehosed it. it's hooked up to the back of the q jet to a diaphragm. i'm not much of a trans guy obviously. can i shift it into high manually to get it to the shop if i have to? it also has developed a little slip. i know it's probably toast but i'd like to band aid it 'til the slush fund can support a 700. thanx, rick