torque converter troubles

The only other thing that I can think of is, if you made no other changes, then the turbine wheel that splines to the input shaft of the tranny is not. The spline pattern of the disc may be larger than the shaft and the tranny ain't turning. If thats the case then it'll be the first I've heard of it. Try running the engine and go from park to low half a dozen times to work out a air lock in the system first.