Steering issues after an accident?

I was in a small accident in front of the passenger side of my truck. It has a BDS 2-inch lift, and the right steering knuckle was bent in the accident. I replaced the steering knuckle hoping that would fix it. But it's extremely hard to steer when I jack up the front end and both tires are off the ground it steers easily no issue but while all four wheels are on the ground it's almost impossible to steer the truck it feels like steering right is harder than steering left. After looking at the steering system to replace the whole system is very expensive. Is it possible just to replace one side of the rack and pinion steering hoping that fixes the problem versus replacing the whole system? Also, am I overlooking something seeing how while the tires are off the ground it appears to work?