This sound is driving me NUTS

[910pidgen]

Noticed this for a while now. Thought at first it was a rock in my brake shield or something. So I replaced all the rear brakes and components. No dice. I have been all over the underneath of my rig and cannot see anything that would be loose or rattling. To me it sounds like a heat shield, or something....but it seems to be rotational.

Characteristics:
- Noticed only at lower speeds. Most pronounced in parking lots/drive throughs. Still present at higher speeds, but not as pronounced.
- Seems to be more pronounced when coasting, but is also present when driveline is under load. But there seems to be a difference.
- Pretty sure it is in the rear.
- Intermittent - sometimes is really loud and other days, totally silent. Cannot detemine the trigger.
- No feeling of this in steering/braking or anything that corresponds to the sound.
- 1993 FZJ80 on 35s and 3"ish (was on when bought) OME lift.

Here is a video:
End of this video is the best: https://photos.app.goo.gl/W5zyBLYP42AJwR8p9

Notice how it sounds as I am slowing.

Any help is super appreciated!!!!

Scott

Had a similar issue on my 94' TLC, could be the exhaust heat shield which is prone to cracking and rattling or a u-joint. Good luck!

 

[offroadvegan]

@offroadvegan did you find the issue? Have you check the rubber mounts on the exhaust?

I was able to check the rubber isolators and they all seemed OK.

 

[offroadvegan]

I also greased the rear DS universals tonight. They took a lot of grease. I'll report back tomorrow after driving it to see if there is an improvement.

 

[offroadvegan]

So last night I pumped the rear U joints with moly. And guess what...I THINK the noise is gone! I am embarrassed to say it might have been something as simple as that. Still plan on replacing them with the Moogs I bought. Thanks everyone!

 

[OREGON85]

Still quiet?

 

[offroadvegan]

Still quiet?

Still quiet!

 

[OREGON85]

Nice!