That kit won't do it. It's not designed to improve shift quality. From their webpage: Corrects/Prevents/Reduces: Converter slip-shudder. Leaks out vent or lever. Front bushing and seal burnup. Drainback Complaint.

I would look at the TF1 Reprogramming kit. It's not as aggressive as the TF2. I put the TFOD-HD2 kit in my 518 since there really isn't another choice, and went with the mildest settings. It shifts very nice in a 4wd truck.