Drivetrain squeaking/chirping diagnosis

[Cortland15B]

I just noticed a squeaking or chirping sound coming from the rear of my truck, me and my dad did some testing. When going slow the chirping was slow, but as we accelerated it got faster. But when we pushed the clutch in, the noise stopped. There is no problems with driving, shifting, etc.

A lot of people on a different forum said it was the U-joint but why would pushing the clutch in stop the sound? Maybe it takes most of the load off of it? I did test the U-joint and there was no play in it.

My dad thought it was the throwout bearing but doesn't that make a grinding noise?

A friend of mine said it might be the transmission seal around the axle, any thoughts?

Someone on the other forum mentioned the output shaft bearing? I looked it up and read about it but no one seems to mention any squeaking problems. Mostly just grinding and shifting issues which I'm not having.

So here's a list of the symptoms:

- Makes a chirp chirp chirp or squeak squeak squeak sound and gets faster the faster you go.

- Sounds like its coming from the space between the back of the door and the front of the back tire.

- Seems to stop when you push the clutch in even when you keep the revs up after you press it in. Or if you rev it up while stopped.

- Makes no sound stopped.

What does this sound like to you guys? I'll take as many opinions as I can get.

I just recently finished a small bed off resto of the rear end. New brake lines, new fuel sender, new gas tank straps, new leaf spring shackles, new fuel filter, welded the exhaust, and I coated everything in chassis saver and undercoating, including the rearmost U-joint and some of it got on the different bushings. Not sure if paint on bushings or U-joints would cause it.

I would also like to mention that the bed was off and the rearmost U-joint was exposed to rain while waiting for parts to come in.

I did disassemble the passenger side brakes to replace a wheel cylinder, maybe one of the shoes didn't seat properly and is rubbing somewhere? It wouldn't fit in with the clutch stopping the sound when pushed in though.

 

[Sasquatch_Ryda]

Rear U joint. remove the shaft, I bet you find it is seized.

 

[Cortland15B]

Does anyone else have their opinion?

 

[Cortland15B]

My only problem is that it stops when I press the clutch in, why would U-joints do that?

 

[buckshotmudder]

The chirp chirp chirp or squeak squeak squeak sound you describe is the same sound I had when my U-joint went bad. Rust will kill it.

 

[bobbywalter]

My only problem is that it stops when I press the clutch in, why would U-joints do that?

load.






pull the shaft and inspect the joints. could be leaf springs as well.