Vehicle movement ignore steepness

Hi, i would like my vehicle movement to drive over terrains with hills, but ignoring any effect hills would have on my movement.

Basically i would like to be able to ride at a constant speed no matter how steep the hill is im climbing. (but still speed up/slow down based on throttle input)

I have played around with alot of variables like gears or mass, but I just dont understand enough about how exactly vehicles work to be able to get it like i want. Another option could be to simulate something with an incredibly powerfull engine that doesnt move fast, but will not be slowed down by anything.