99 Tahoe rebuilt 4l60e been in there for 3 years now. OMW home this morning i was SLOWLY accelerating and it's like someone flipped a switch, and my transmission became disconnected. There was no noise or jolt. No indication that something bad happened. I came to a stop and it will hold in park, but rolls in every other gear. The linkage is all there and working.All fuses are good. I put some lucas transmission fix all and nothing...any ideas? Thanks