The cause of the pull right or left with the 4wd launch is usually having the torsion bars cranked up and having a steep cv angle. With a nice level cb angle, it will pull fairly straight. And most half tons launching are lowered and have a good cv angle. Even on my dmax, I'd drop the torsion bars all the way down, and was 100% better than with it even at stock level. Hope this helps. Good luck