Suspension feels weird

When driving down the road it feels like IM in a boat. The car sways and rocks side to side. It got worse after I got the car back from having a new tranny put it. I bought some new control arm bushings (havent had them installed yet) thinking that may be the problem. But I need to be sure.
Thanks.

When was the last time you changed the struts. They are probably due for a change

Haven't changed them since I got the car. Guess I will get some next week. Thanx