my truck started making an odd sqeelling noise.. help?

[cmauz61]

hey guys, my truck start making a very odd noise that i cannot seem to find....
it only happens when the clutch is engaged on decel, constant cruise control like throttle, and very very light throttle.. when i push in the clutch the noise is gone and in neutral there is no noise. Under a load it is silent and makes no noise.
the noise will happen is any gear and gets crazy loud on occasion.. here is a vid of the noise. its not easy to hear here, but it gets way louder on occasion. fluids are all full and cant find anything loose.. any help would be greatly appreciated.

here is a video of the noise

http://s173.photobucket.com/user/jcmauzey/media/20151015_231708_zpsleipyut9.mp4.html?sort=3&o=0

[PToombs]

Weird sound, doesn't sound like a rotating noise, more like a spring squeaking or something. Have you tried just touching the clutch pedal? Not pushing it far, just a little? I wonder if the throwout bearing is getting bad, because it stops when you step on the clutch. Maybe it's the input bearing, that is affected when you push in the clutch too. Check the trans oil and see if its all metallic.

[thrashingcows]

Sounds to me like it's a metal on metal rubbing noise. Could be transmission mount bushings worn out and rubbing when the drivetrain is under certain torque situations? Almost sounds like front springs rubbing, bad spring bushings with road conditions?

[cmauz61]

throw out bearing is sweet. only 3000 miles old and i can here it quietly. it was bad when i got the truck, so i know what that sounds like.
its only happening when the clutch is fully engaged. a quick on off throttle does the noise and a cruise makes the noise so loud its crazy, sounds like im about to break down..
trans oil if 1 quart over full still. i will check the fluid tomorrow for metalic..
i will check the tranny mount rubber and how would i check the spring bushings or what would i look for?
under heavy throttle it is completely silent like normal.

[thrashingcows]

Spring bushings is just by look. If they appear to be in good shape...not puking out around the bolts and shackles, then they are most likely OK.

Maybe it's a U-joint, or carrier bearing?

[Philip]

Pull the drive shafts out and check for a frozen up u-joint. When you were on and off the throttle I could hear the drive shaft clink. Most of the time that clink is u-joints.

[cmauz61]

thanks for all the replies. transmission fluid is clean, but i had a frozen u joint....
I am putting it back together tonight and i will let you know if the noise is gone, but i am assuming it will be.

[thrashingcows]

thanks for all the replies. transmission fluid is clean, but i had a frozen u joint....
I am putting it back together tonight and i will let you know if the noise is gone, but i am assuming it will be.

Hope that solves your problem.

[cmauz61]

the noise is gone! it was the u joint! thanks for the help

[Philip]

the noise is gone! it was the u joint! thanks for the help

Glad to hear it was a cheap fix.