Hi Guys/Girls

Im new to this whole transmission tunning and wandered if someone could point me in the right direction.
I have a 2.2 Ford Ranger (UK spec) which I have heavily modified cosmetically.
One thing that has always bugged me is the way the box hold gears for to long. Its a 6r80.
What are the options I have to tune this box/adjust parameters and how do I go about doing so?KY16VFT.jpg