I have 20's.... I believe it's the flexing from the spindle only being held in by two bolts. I was wondering if anyone else had the problem and if so, how they corrected it

 

You have the nut on the stud dont you?

 

No it doesn't come out of the back of the spindle ....

 

On the McG kit we installed, the backing plate cut template provided did not remove enough material for proper clearance. The backing plate still rubbed. Had to make our own marks, pull it back apart, and cut more off.

Hope you get it figured out, squealing brakes are annoying as hell.