Problem with Rear outside upper A arm bushing.

I have an issue with my rear upper outside A Arm bushings (at least I hope it is only the bushing). I didn’t realize when I took my old tires off and just went to install my new kenda bear claw HTR’s that after installing them and torquing down the lug nuts that my rear wheels move from side to side so I thought it was a bad bearing and took the wheel off but when i push back and forth on the brake rotor I can see the upper outside a arm bolt moving back and forth in the hole. I tried to tighten it but it was already very tight. This was going to be the first weekend i was going to be able to use it since i bought it 2 months ago. At the top of the wheels I would say I have around 1/4" of play.
Does this sound like a bushing problem or is it that weld a washer to the outside of the a arm fix I have read about?
Would I do any severe damage to the quad if I used it anyway this weekend and changed the bushings when I got home?