My Hyper 7 had a collision, except it involved a 1" plywood wall, and a snotty little kid on my frequency. Needless to say, my steering had similar problems, would steer fine in one direction, and the other direction was horrible. It took me a while to figure out, that my steering knuckle had cracked, and the CVD on the same side was slightly out of whack. I was able to salvage the CVD by putting it on a vice and straightening it for the next heat, but had to replace the knuckle with one from a 9.5......since then, never had a problem.

If that's not the case, check your servo gears, you may have stripped them in one direction.....personally, I would unassemble the entire front end, including the diff, and check for damage...