try jacking the car up and turning the wheels, have them at full cock either right or left, then spin the wheels by hand, are the axles making contact with anything?? Sometimes people attach the bottom of the strut backwards to the lower control arm and the axle will hit it when the wheels are turned, not calling you stupid, but it's a mistake that can happen. If the axles aren't making contact with anything then repeat the process with the wheels on the ground and try to look (may be more difficult to look under the car while it is on the ground) see if the axles are hitting anything.
if the axles aren't making contact with anything and the car binds when you are trying to drive it, then you may have a bad differential, causing the wheels to try to turn at the same rate around a corner, making it difficult or impossible to steer.
Check your tranny fluid and make sure you have the right amount and correct type of fluid.
if you are still having aproblem and you can't find the culprit, them maybe your differential is bad.