My GTA has a slight problem. It will not down shift into first at any higher than 20 MPH. If I'm below 20 it will down shift right into first when I mash the throttle. It's hopeless at anything above 20 though, it'll just lug (in 2nd) until it hits 3200 then it'll take off. What could be doing this? I have a buddy with an 85 TA and he really can smoke me on the back roads because of this. The TV cable is already pushed in a couple notches after adjustment so I know it's not that. Help me out.