Hello and congrats and welcome to the brotherhood of ZR-1 amazingness . Yellow is an awesome color but remember the cops will find you easier lol .
How long has the car sat ? It could be just a rusted disk brake but also a wheel bearing or u-joint as you mentioned . I would also check the dif oil . Maybe that needs to changed along with other fluids also ..
Others will chime in soon ...We're all away this week driving our Z's
Mike
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