Glad it was fixed.
Not going into reverse is a classic sign that the disk is not releasing. First thing to check is the clutch pedal adjustment. Needs to be 1" of free play at the pedal pad with finger pressure. A little bit tighter can some times help but is not the solution. If the adjustment is right and you do not find any lost motion in the linkage, the clutch assembly is the usual suspect.
I took out a Centerforce (for a different reason) and went back with a LUK as well. Could not be happier.