I have a 87 Iroc and it has a 700R4. When i get on it form a dead stop the can shifts form first to second at 6000 rpm but second to third it shifts about 5500 and the same form third to forth. Also i noticed that the car would not shift in to 4th when it is to the floored at about 120 it would not shift itn to 4 please help

Shane

 

Ok, the first to second shift is prib your tranny slipping. It is supposed to shift at 5500 rpms, but slips to 6k in first. the servo wont allow a 3-4 wot shift, but I believe that there are servos that you can get that would allow you to do this. But dont take my word for it, I have heard it go both ways, like it can or cant be done.
hope that helps
Chris