Ok looks like its the linkage inside the transmition , there is a long linkage thet has a ball type thing on the end , that pushes it into park. That part has come loose , all the gears work fine but when you get any where close to park*(meaning rev) it goes to park and gets stuck.. . if I stay away from reverse it works fine . just cant back up unless I do it in nutral and push.. Hope this helps somebody ,not rebuilding it the cost of labor is over 800 to 1100 thats what the shop says.