Need Help, Jeep Wrangler Speedlimit 30km/h

Im new to tuning by my self, have bought files in the past. Now im trying on my own but need som help
Im trying to make this Jeep Wrangler 4.0 Auto -04 Have a speed limit at 30km/h. We have a type of car here i sweden you can drive when u are 15yr but it can not go faster then 30km/h.

I have tryed to set the speedlimit at 30, i have tryed to have rpm limit set, but it still changes gear to 3,4 and then it goes 60km/h.
How do i stop gearchange? i only want 1-2.
Anyone have any tips?

HW: JTEC+ ECM, Dodge/Jeep 99+
OS: 56044447AD
VIN: 1J4FAB9SX4P760225