One question.....did you slide the 14 spline disc on the input shaft after you "lengthened" the splines? If you don't get the end of the factory splines "tweaked" just right, the disc will NOT slide to the rear.
How do I know this? I got in a hurry after extending the splines and didn't bother to pull the pressure plate and disc. Same problem! Popped out the disc....checked for 1/4-3/16 movement past the end of factory spline and even though it looked good....it bound up on the end of the spline. FINE TUNING the end of the factory spline did the trick. No washers, no binding, no hassles! I hope this helps.
