Renault Laguna loud huming sound from front end

hello my car has a loud humming sound coming from the front end but cant tell if its worse on 1 side or the other, sounds like a bearing but its deffinatly not, theres no change in the sound whether your on a straight road or going round a corner, had the car jacked up and when i turned the wheel on the drivers side there was movement in and out were the driveshaft goes into the gearbox. only had this problem since mot. was doing work for mot and pulled the passanger side driveshaft out and spilt all the gearbox oil, replaced the driveshaft and oil but could it be anything to do with that?? thanks