who thinks they know what this wierd sound is?

[blueb8llz]

my slipper is like one full turn from being the tightest already. its still a fairly new truck. it didnt do this untill like a week ago. i cleaned out the bearings on the out and inside of every wheel. very funny thing is also if its a bad slipper would it do this:
i place my truck on my lap. the front of the truck is facing away from me. i squeeze the left and right front tires with my thighs so that both front wheels dont move. then i turn both the back left and back right tires with both my hands in the same direction, this is when itll make that noise...creaky noise or whatever the sound.
i turn my truck around and do the same thing and turn the front two wheels this time, and same thing, i hear the noise in the rear.