3.4l Tacoma squealing bad!

Ok so my truck it's squealing bad. The radio can't even drown it out anymore. It doesn't squeal at start up or idle but only when I'm driving an take my foot off the accelerator. It squeals till I apply the brakes an slow down or if I push back down on the accelerator. It use to only squeal when I had been driving for about an hour or so but now it does it every time I drive it. I've replaced the serpentine belts awhile back assign that didn't help. I thought it could deal with the timing belt like maybe the idler pulley? Idk I need help cuz I'm going crazy!!!!

 

Idler pulleys perhaps.

 

Only when your moving? Are you sure it's not a hub bearing or something. Brakes?

 

It happens at certain rpms basically higher rpm it stops but lower it squeals

 

so i just checked some pulleys. an the tesioner pulley is on the very bottom right? well if so i checked it an it wiggled a decent amount. could that be the source?

 

If you remove the accessory belt, then you can spin the pulleys by hand. You'll be able to tell really quickly if any have play, or generally sound rough spinning.

Like the tensioner pulley.

 

Ok I'm gonna try that in the morning for sure

 

I have the same issue, squeal coming from under the truck somewhere from the mid point back it sounds like. It does not happen during idle or acceleration but as soon as I let off the gas it starts and will continue down to about 15 or 20 mph or so. I have also replaced the belts and it did no good. Seems to happen more when it's cold outside.

 

I'm able to put my truck in neutral, kill the engine, cost and still get the noise. With the engine off that pretty much rules out any belts or pulleys right?

 

ujoints?

 

Well wasn't the tensioner cuz I ruled it out for sure.

 

I have the same problem with my truck. It happened last winter and I took it to a shop and they couldn't find the problem. By summer it completely went away but guess who shows up this winter?! Yep the squeek... We need to figure it out!

 

Ok mine also squeals even when i turn it off an coast. WTF!?

 

I've been doing a lot of research an I think it could possibly be a bad rear axle bearing. But still not sure...

 

Drivetrain bearing of some sort.

The carrier bearing, or axle bearings. If it is an axle bearing, you can touch the hub after driving. If it is really hot to touch, then the bearing is bad.

 

Im replacing my carrier bearing possibly tomorrow so we'll see if that was it ill update as soon as I find out

 

Well gotta wait for the part so it'll be a couple days

 

Its been snowing here do no real update besides I haven't heard the noise in two - three days so idk Im probably still gonna replace the Carrier bearing just waiting though

 

I have read a lot of forum replies on this and I can tell you this. I had the same exact problem (squealing only when letting off the gas /cold weather only/. I bought a $25 grease gun and lubed all the drive shaft zerks. No more problems. My truck had 260000 miles with no lube maintenance on the drive shaft.

 

yea i got a grease gun from work and didnt have any problems for awhile and i heard a faint hint of the squeal the other day so its about time to get under and grease it up again