1991 Chevy Van CLANK! Whats wrong with my Chevy G20 van?

1991 CHEVROLET VAN
200,000 MILES • V8 • 2WD • AUTOMATIC
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TUNACRAB
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OK this is a two part question, as there are two strange noises that are coming out of my van.

The first:

There is a very loud metal-on-metal clank that I hear whenever I am backing up and apply the brakes with any kind of force. After this happens, it will happen again the next time I hit the brakes in drive. It sounds like there is quite a bit of tension being released, less like metal actually hitting metal. This has always happened since I bought the van. It has gotten progressively louder. Also, I am now beginning to hear the same sound when going over bumps and potholes. What is about to fall off my van? The pitman arm, idler arm, and lower ball joints were recently replaced, so I doubt these. Also, I remember the mechanic saying the tie rods won't need attention anytime soon, so I doubt these as well.

The second:
This has something to do with the shifter. This only happens when the van is in drive. It sounds like squeaking, much like birds chirping, slightly lower in pitch. It is rhythmic, fast, and repeating. There is a "sweet spot" in drive where this noise is not made, but it always shakes itself back to being noisy. This started, very faintly, about a year ago. In the last month it has gotten much worse / louder. Also, the sweet spot got smaller. What could be causing this? I have no idea about this one. The transmission has always worked, so I ignored it in the past.

How bad off am I?

-James
Oct 1, 2009 at 8:50 PM
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OBXAUTOMEDIC
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Hi James,

On the Clank does it sound like it is coming from the front or the back?


Now the squeaking - It could be the U-Joints in the drive shaft are going bad.


Mark

.
Oct 1, 2009 at 9:03 PM
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TUNACRAB
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Hello,

The clank is coming from the front passenger side.

I also neglected to say the squealing problem only happens at idling speeds. It stops when I push the gas. Also, a little more clarification on the sweet spot... I am speaking of a spot on the actual shifter. If i pop it in to neutral, reverse, or a lower gear, it doesn't make the sound. It only happens in drive. When in drive, slightly touching the shifter arm up or down affects the sound, one spot being the sweet spot that makes no noise.
Oct 1, 2009 at 9:44 PM
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OBXAUTOMEDIC
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Ok,

The Clank could be the Sway Bar Link is worn and bushings are gone or the Control Arm Bushing. You would need to crawl under it and take a look.


The sqeaking - could be the Torque Converter or possibly the Flywheel - but the slight movement of the shifter affecting the noise gets me.

.
Oct 2, 2009 at 2:55 PM
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TUNACRAB
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OK I figured out the clank. The lower control arm is held in to the frame by two U-bolts that go around the shaft. One of the bolts cracked. The part was discontinued so I ended up searching junkyards for another G20 van. Luckily I found one today. My mechanic is installing it now.

As for the chirping / squeaking noise, would anyone find it helpful if I were to make a recording of it and post it online?

Thanks,
-James
Oct 5, 2009 at 3:06 PM
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OBXAUTOMEDIC
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Yes, it could help in diagnosis.


.
Oct 6, 2009 at 12:07 PM
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MATT1987
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Did you ever figure this squeaking out?? I am having this exact same problem in my 1989 G20.
Jun 3, 2021 at 2:25 PM
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ASEMASTER6371
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Good afternoon,

Can you upload a video of the noise for us to hear? This could be a belt, tensioner or one of the driven components. Hearing the noise will help me narrow the area of failure.

https://www.2carpros.com/articles/car-squeaking-noise

Roy
Jun 3, 2021 at 2:49 PM
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MATT1987
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Thanks for the reply! This is the sound. Chirping a lot, in drive or park or reverse. This happens when moving, or idling. I don't notice it happening in neutral. As you see in the video, adjusting or touching the shifter slightly will stop or exaggerate the chirping. Thank you for any help!!!!!
Jun 9, 2021 at 1:24 PM
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ASEMASTER6371
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I am sorry. There were no sounds at all on the video. Can you take it again and turn up your sound on the record?

Roy
Jun 9, 2021 at 2:00 PM
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MATT1987
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Okay, no problem. does this video sound any louder or better?
Jun 9, 2021 at 3:47 PM
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ASEMASTER6371
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Much better.

I would start by removing the drive belt and see if the noise is still there. It could be one of the pulleys, water pump, or alternator bearings making the noise.

Roy
Jun 9, 2021 at 5:28 PM
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MATT1987
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The part that puzzled me, is that as you can see in the video when I touch or slightly move the gear selector, it can stop the noise all together, but eventually the noise does come back. Do you still think that would have to do with the drive belt? Thanks for your help!
Jun 9, 2021 at 6:24 PM
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ASEMASTER6371
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Yes, I do. You need to start somewhere and that is where I would start.

Check that and get back to me with the results.

Roy
Jun 9, 2021 at 9:47 PM