Does the car also creak when going over bumps at slow speeds?? Take and pull the top of the wheel from side to side. There should be no wobble in it. If there's wobble, ball joints are in your future.
On the 140 ball joints are easy to replace...
There are threads where guys replaced their ball joints on a 124 body car without taking the springs out, or dropping the arms. I posted in one a while back.... He had a nice pictorial on how to do it as well...

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Too many people tip toe through life, never attempting or doing anything great, hoping to make it safely to death... Bob Proctor

'95 S320 LWB
'87 300SDL
'04 E500 wagon 4matic