2008 F150, 60,000 4x4 auto SC

Friend reports that when the truck is hot, and when he is in full lock turning left, he is getting a rattle, clicking type sound. Mainly while backing up. Doesn't do it to the right. And, again only after the truck has warmed up.

If he stops and puts it in neutral, and revs the motor, then goes back into reverse it will go away. (How he came up with that, is someone suggested maybe a vacuum issue)

Has taken it to a couple shops and they can't figure it out.

Anyone have the same issue on this forum?

It's driving him crazy.