Bad squeaking under truck

I have had a bad annoying, loud squeak under my 2003 prerunner. I have had all the belts changed including timing belt and it is still there. The auto mechanic I go to cannot figure it out. Please help!!!!!!

 

family of field mice...

 

Need lots more info.......

WHEN does it squeek?

With speed? With Rpms? going over bumps? while driving? While sitting still? when you hit the gas? When you're flying thru the air?

 

It squeaks while driving, and it happens randomly. Sometimes bumps will trigger it, sometimes not. Almost think that it only happens on deceleration(it doesn't happen when I am gassing it) It can go for half a day with no noise, then boom, there it is. Let the truck sit for a while and it's gone, for a while. Very frustrated, and I'm totally appreciative of all your suggestions

 

Buy some grease, get under the truck and grease the carrier bearing. Fixed my squeak.