sloppy splined u-joint yokes

[musselmark]

I have a 2004.5 400 sportsman and the splined shafts/yokes are all a bit sloppy, especially the main driveshaft to the rear diff. At top speed you feel the vibration but a slower speeds you don't notice it. Is this common with polaris machines, there are only 1500 miles on my bike. I assume the only fix is to buy new yokes or probably complete shaft assemblies.