i am basically a novice my plan was to buy the trans off a local seller out of an 87 caprice ,,,,i saw a tci valvebody for $189 .00 said it keeps 200 psi constant line pressure and supposed to extend life of clutches etc and other info but still have time to research everything ,,,, next planned on getting a converter a buddy told me ones are available that eliminates the need for the electrical kit for the 4th gear issue was going that route and lastly ,,,, having it rebuilt buy a local shop seems its gonna cost a good chunk of coin to swap out the th350 but my thinking is change rear gearing from 3:42 to 3:90 figure the OD would be better on highway ... thanks for the info from both of you