Loose Trailing Arm Bushings

[70C10I6]

I just installed new original type rubber bushings into my 70 C10 trailing arms. I placed the new bushings in the freezer prior to hammering them in place. Now, after all temperatures have equalized, I can slightly rotate the bushings. The outer shell rotates 2 - 3 degrees each direction in the the trailing arm. I'm assuming this is not acceptable? Would it be okay to tack weld them in place? Has anyone else had this experience? Any help would be appreciated.