I imagine both the door and striker can be adjusted, but am not sure as I'm not at my truck. I would losen the striker and see how much play is built into it, then leaving it lose adjust the door hinges until it's level then and lastly lighten the striker in the correct position. Again, though I've never done it. I wouldn't be yanking on anyting though. You might just bend something that could have fixed the problem if straight.