727 with 2/3 overlap

What size band does it have? When you get past about a 3.8 lever, you need to run the widest band you can get in there. As far as I know, the only thing that used the 5.0 lever was the Hemi and they all had a wide band. I think the restrictor was a good idea. What's happening on the overlap is, the transmission is trying to shift into second and third at the same time and the restrictor delays the fluid flow just enough to straighten that out.