Some Renaults have a short driveshaft connector on the drivers side diff end. This may have stripped the spline. You will not be able to see if it is spinning or not. The output spline may also be worn but is made of harder material. The dealer will try and sell the whole shaft but this part is available for less than 20 pounds. If your car has a speedo drive on the diff you will see a road speed in gear. Of course it could be something else, good luck
mags
November 2010