My 98 reg cab started to have a squeak coming from what sounds like the rear wheels. The sound "squeak go in and out with what souns like a rotation. I've had the drums turned and trued but haven't replaced the pads yet. I've already done the fronts so I know it's not them. It squeaks even when the breaks aren't being applied and at what sounds like about all speeds. I though either a u-joint? or a wheel bearing? Any ideas? It has been lowered 3" in the rear and 2 in the front with coils and hangers. Thanks to all.

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1998 F150 XLT 2WD, reg cab, styleside, swb, 4.6L, auto, red w/grey int.
Modifications: Replacement black leather steering wheel, Leather seat from Lariet, cd/cass combo from a superduty, 4WD bumper with lights, 4WD fender flares, Ground force lowering 2/4, 17" STX rims with 255/60R17 tires, Roll-n-Lock cover.