My first trackbar was replaced at about 32K miles and has been replaced a little under 20K from there to now. I have 18K on this trackbar and it is shot. Mine is a quadcab, dad has a regular cab and got 115K out of his original trackbar. I really don't know if there is a correlation there or not. I checked his at about 90K and it was still tight. It seems to vary by truck as to when it needs replaced. Have someone saw back and forth on the wheel while you look at the frame end of it. . 080" of freeplay is the tolerance Dodge gives for it to be bad, but it starts to drive bad on mine at about . 040".
I have not had an aftermarket trackbar yet, but I have been told that the DT is the best made. Dad put a Lukes Link in his and loves it. You can search for both and get more info. Hope this helps.