As I passed the 60k mile mark on my '88 quad a bit of a handling issue has arisen. At any speed, I get the occasional sensation that the back end is drifting somewhat. When I change lanes at highway speeds it's as if the back end drifts slightly in the direction that I turn the wheel. This isn't the tight response that I've been used to, and it's a little unsettling as you start to question how the car will respond if you have to make a sudden lane change. At slow speeds, if I go down a road turning the steering wheel left and right between eleven and one o'clock, the rear end just feels like it's "loose" for lack of a better term, and there is still that slight drifting or floating sensation. I'm not hearing any unusual noises, but something seems amiss. Without getting out all the receipts, I don't think I've had any parts replaced or other service done on the rear suspension. At 62k miles and 23 years could I be looking at worn bushings, shocks, springs? Are there simple tests to determine what might be worn out? I doubt that these are repairs I will do myself, but I'd like an idea of what I could be getting into. Any input is welcome. Thank you.