I have an 86 Z28 I recently brought back from California. It drove and shifted fine the 2,000+ miles home. A couple weeks later it was delayed hard shifting and now it won't go out of first gear. I changed the tranny fluid/filter/gasket. And I know they plugs and wires were recently changed. I had a tranny guy drive it and he didn't think the transmission was bad because it shifted strong when it did shift. Any thoughts would be appreciated! Thanks

 

You could have a bad TV Cable (sticking or frayed). Look at it for obvious signs of this when the engine is off. Then readjust the TV like this: To adjust the TV Cable skip the book method and do this: Press the 'D' shaped lock button on the adjuster and loosen the cable setting (The black housing that the metal cable is in will move forward). Now, have someone floor the gas pedal while you check to see if the throttle plate is open all the way. Usually they are off a little and will wiggle. Do whatever you have to do to get it open solid. Now, with the pedal still floored, press the 'D' button and pull the cable casing (the black tube) back as hard as you can (putting maximum tension on the metal cable) and release the button. You now have the engine, tranny and gas pedal all in sync at WOT. Mark the cable casing so if for some reason it gets moved you can know where to put it again. The problem with the 'self adjust method' is that it bends things and puts them permanently out of whack. It is also the full TV setting, which is theoretically what the GM method does.

If that doesn't take care of it then you likely have hte common sticking TV Valve inside the VB. The best/true fix is the TransGo Shift Kit or Reprogramming Kit.