W126 loose steering

[sixto]

I know my outer tie rods have torn boots so they're in line for replacement. I've yet to properly check the rest of the steering linkage -- I've been told that yanking and twisting isn't sufficient

Despite the torn boots on the outer tie rods, it tracks straight and true. For the most part I can't tell that anything's not right with the steering. However, when I turn the wheels almost to the stops, I feel a slight clunk as I start to turn them straight again. The clunk feels like there's a lag between when I start to turn the steering wheel and when the road wheels catch on. Is this a result of worn tie rod ends or am I looking at loose knuckles and/or deeper problems?

Thanks,
Sixto
91 300SE