I understand you want to change the shift pattern for your vehicle. You may have changed wheel sizes, for example, and want an easy way to adjust the thresholds without the hassle of swapping out chips on your auto trans unit. Depending on what part of the world you're in, Jaycar Electronics has a module you can just wire in. They're not showing it on their website, so I'll check back through paper catalogues for a part number for you.