Just done a search and found this by another poster............hope it helps.....



Same day, steering racks for both my MY01 E430 and my MY02 ML320 were replaced!!!!!!!!!!As some of you may know, my ML went in for B service a couple of months ago and came out with a steering that sounded like an eerie windy night, at the slightest movement of the wheel. Diagnosis: steering rack needed replacement, was backordered. About a month later, the E was due for B service. Came out with similar eerie noise!!!! Diagnosis: You guess it!! How can that be possible? I called my SA and asked if same tech worked on both cars - No! Could it be their equipment - don't think so 'cause both have been in for B at least once before this. Both were replaced yesterday and I'm glad they were both under warranty.

If you ever have this problem, here's what you'll be facing (directly from my service order):
1) Remove both axle rods
2) Remove drive shaft
3) Remove differential (I asume front only!!!)
4) Remove power steering rack
5) Replace power steering rack
6) Installed new seals and drain plug on diff
7) Filled with P/S fluid (synthetic)
8) Reinstall axles
9) 4-wheel alignment

In between, they had to pull out the torsion bars and all many other small stuff. Like I said, I'm glad it was under warranty!!!

The good news is that the truck drives much better - no I'm not exaggerating. Many funny noises have disappeared. Even the cracking noise is gone (I suppose since they had to disassemble the torsion bar they probably found issues with the bushings too!!!). Anyway, I love the smoother front end.