Rear Disc brake Issue

[marks86]

So I install rear discs on my truck not to long ago I cant remeber what brand bracket I bought, but I did buy all the higher GVW rotors and calipers from a 1986 k20, along with an adjustable proportion valve. Now ive been driving it and I noticed my pads have been sticking and making a horrible screaching noise. So i took the rear wheels off and the pad WITHOUT the clip on it is loose where I can move it around I would say 1/8inch all directions can anyone think of what would be causing my pad to be loose, it has been sticking and getting so hot to the point where its making my axles seals leak

 

[da_raabi]

Maybe the slide pins are not perfectly parallel making the caliper bind on one side? Thats a really weird one!

 

[marks86]

Ive discovered it only makes the horrible screaching sound when taking a left or in revearse