My 2011 Ford Transit Connect shifts hard to the right or left at random. What should I do?

Update: My 2011 Ford Transit Connect jerks hard to the right or left at random while driving straight. I can get control of it, so its not a terrible jerk, but it scared the crap out of me the first few times so much so that I had to pull over. It does this with no rhyme or reason. However, I recently replaced the front... show more My 2011 Ford Transit Connect jerks hard to the right or left at random while driving straight. I can get control of it, so its not a terrible jerk, but it scared the crap out of me the first few times so much so that I had to pull over.
It does this with no rhyme or reason.
However, I recently replaced the front passenger side wheel hub because it wasn't spinning, so maybe I messed something up during the replacement? I'm not a car guy, but can learn and do the work myself.
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