Still having trouble diagnosing 3rd Gen Explorer XLT noise that comes & goes...

I have a 2005 automatic 4×4 Explorer XLT, all the bells & whistles, sans the 289 V8, & I have replaced rear parking brakes shoes & hardware kit, new rotors, pads, & calipers, also had rear diff serviced & new sway bar links put on. (All parts from TRQ/1A Auto) However, every time I start it & it gets even just a lil bit warmed up, every time the rear wheels make a revolution, I get a whining or winding sound from the driver side, & possibly passenger, rear wheels. It comes. And it goes. It calls for 235 70 16s, but I put some brand-new Dunlop 235 60 16s on it that I bought for $5 apiece, & was wondering if that could be my problem? Any thoughts/input appreciated! Also, it NEVER makes the noise while in the air! Only when actually being driven on the ground, w/the vehicle's weight on the damned wheels. Would love anyone's thoughts!