I have a 86 silverado. I was told it has a 350 with hydrualic rollers and a TH 350 tramsmsiion. Who ever worked on it before me did some stuff on it by cutting lines wires etc. I recently changed the plugs, wires and added some new vaccum lines. I think I changes a lines that effects the way it shifts now. It will not shift while driving.
This is my main concern now so I can actuallydrive it to troubleehoot more.