Help with unusual KJ noises - videos

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2002_KJ

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Hello,

I have these two distinct noises coming from the rear of my 2002 KJ 3.7L V6 automatic.

The first is a continuous hissing noise that seems to be coming from the rear axle/differential area. Some research lead me to believe that perhaps it has to do with vacuum tubes or fuel vapor tubes but I thought I’d make a quick video and see if anyone can help confirm.

The second noise also seems to be coming from the rear undercarriage area and its a continuous rhythmic thumping. I was thinking maybe something to do with the exhaust?

I realize I just need to get under there and poke around but again I figured if I made a video and asked here first maybe I’d have something to go on, thanks!

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LibertyTC

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I only see images no video, try youtube..
Just to be sure, Is the rear diff a hissing noise while parked ?
If so it may be best to have it tested by a shop that has a smoke machine.
Look forward to 2nd video, thumping noise as well.
 

2002_KJ

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I only see images no video, try youtube..
Just to be sure, Is the rear diff a hissing noise while parked ?
If so it may be best to have it tested by a shop that has a smoke machine.
Look forward to 2nd video, thumping noise as well.
Sorry, I tried using Imgur which is terrible...I edited the post and uploaded them to Vimeo, hopefully that works better.

Yes the hissing noise is there while in park.
 
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LibertyTC

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Pretty sure it would have effected Jeep is some way, how was it when driving?
Did an engine light or code ever appear ?
 

2002_KJ

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Pretty sure it would have effected Jeep is some way, how was it when driving?
Did an engine light or code ever appear ?
I couldn't really tell much of a difference before and after, feeling-wise, other than it not sounding like a locomotive anymore with all that hissing and thumping. Hard to tell really...maybe a little less sluggish? Like the tires had been filled up with air if that makes sense.

Engine light never came on though, which I kinda would have expected. I'll see if the MPG average goes up after a while...
 

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