Isentropic

Hello All,
I guess I have two separate issues, but thought I'd lump them to save people's time.

1st issue:
For the past month or so, my RX has been making this weird vibration and noise from the under body near the engine (maybe transfer case?) It is usually when it's cold and at low speed. But sometimes it does it even when the engine's warmed up for couple minutes.

I did change the transfer case fluid and rear differential about 3 months ago. Not sure if this is related. Any help would be greatly appreciated.

2nd issue:
Yesterday, I went over a large block of snow, and part of my underbody shield broke off. I miss my ol ML320...much more robust

Can I just buy this from the dealer? Or is there a cheaper option somewhere else.

Thanks much for the feedback and help.

LSBen

for the 2nd issue, I believe Carid or Partsgeek.com has aftermarket options that are more affordable.