rocking feeling when goign above 60mph

I have a 2001 dodge durango and had gotten in an accident where i hydroplaned and hit the side of a curb resulting in two chipped rims, a flat tire, and a bent axel. I got it all fixed and tried driving it on the highway. On the highway when i surpass 60mph my car feels as if it's beingn dragged to the left and back. so it feels like it's rocking. I contacted my repairman who is a close friend of mine and he said he fixed everything including realignment. I was wondering if anyone knows what this problem is and the solution to it. I don't feel the rocking movement when driving under 60, but if i go over 60 i feel it.