howl after 5100 install.

Hi all.

Last week I had my truck leveled by a shop that I've used before (and does great work).

This is the second Tundra that I've done the Bilstein 5100s (top setting) in the front and 5100s in the rear with a 1" block.

This time around I seem to have gotten a slight driveline noise or howl coming from the front end. Before I start looking into it, I thought to ask if others have experienced something similar? It's not that bad and I know alot can change with a level until it settles in a bit.

I didn't have the diff drop done, mainly because I didn't have it done the last time and all seemed OK.

Anyways, interested in others ideas . . . Thanks very much.