I have a Friend with a 84-85 camaro with the 700r4 trany not shore if it is the early or late 700. This trany will shift out of first with the shifter in first at about 3800-4000 rpm,I think i remember that the Early 700s did this . The trans works perfect other then this ,can something be changed in the valve-body to stop this? To hold it in first. Thanks in advance