I had a creaking noise coming from the leaf springs. Checked them out and everything was tight and nothing warn. This noise drove me nuts. One day I got the WD40 out and sprayed the leaf springs and the noise went away. As the springs get some age on them dirt and such covers them. There is some rubbing that goes on between the leafs. So using the WD40 it got between the springs and eliminated the creak. About every 6 months I spray them down or if I hear the creak noise again.

 

just wanted to add my 2 cents. my truck squeaks, creaks or however you want to describe it, when I go over a speed bump also. Its coming from the control arm bushings. OE ones are rubber crap and they will dry out, chap and crack. When there dry and they rub against metal then THATS when you get your sound!!! Espesially if you has crappy OE shocks to go with it.

 

I would lean away from driveline issues unless you have problems shifting into gear or the transfer case.
Do you wheel your truck or is it just on pavement all the time?
Is it a creak or a pop or knock kind of sound?

 

This may not even be in the same category of creaking you are experiencing, but if you've checked all the driveline items, and are still stumped, you may have what I have on occasion. After my truck gets wet (washed or rained on) the gas tank straps start to creak and make all sorts of noise. A little WD-40 between the cab and bed seems to cure it for a while (40 days) unless it rains again.

Might be totally off, but its worth a shot!

 

It's definitely a creaking noise, mostly hear it over bumps and such, but it's happened once or twice while fully rested at idle, which is why I'm thinking it might be a bearing on once of the components in the serpentine belt configuration? I understand if it were the case, it would most likely happen all the time, but wondering if the 'bump' part of it might tweak something just right?

Like I said, I'm lost. 2 shops haven't been able to figure it out, friend with a dealer license who drives vehicles everyday at auctions can't figure it out. Drives me nuts.

 

Can you make it creak by jumping up and down on the bumper?
When it makes the noise can you feel any slight vibration in the steering wheel or floor or pedal?
Does it happen if your A/C or defrost is off?
Are there any odd driving dynamics beyond the noise?

 

I can't get the creek to simulate no matter what I try. I've tried doing the bumper thing first, since I thought it was a bad shock, but nothing. It's year round, ac/heat doesn't seem to matter. No real difference in driving dynamics, and what's frustrating is I can't nail down any rhyme or reason as to why it does it sometimes and not others. You'd think every bump would make a suspension noise reproduce itself, but not in this case.