Okay JK tech gurus, time to fire up your crystal balls for me.

I once had a piece of plastic shopping bag get caught up on my exhaust and kinda melted. It had a very weird burning smell to it. Hard to find as it somehow ended up on top of my muffler.
 
Check the driveshaft boots if stock. If torn it might throw lube onto the undercarriage. Freshly greased aftermarket driveshaft too possibly. Just throwing ideas. Chupacabra works too.
 
I once had a piece of plastic shopping bag get caught up on my exhaust and kinda melted. It had a very weird burning smell to it. Hard to find as it somehow ended up on top of my muffler.

You know, thinking about this, is there any chance the OP installed a new muffler and maybe forgot to remove the protective plastic on it? I know of another member who did this and he had a funny smell afterwards.
 
Check the driveshaft boots if stock. If torn it might throw lube onto the undercarriage. Freshly greased aftermarket driveshaft too possibly. Just throwing ideas. Chupacabra works too.

When new, my aftermarket shaft DID do this. That was quite awhile ago, though.
 
You know, thinking about this, is there any chance the OP installed a new muffler and maybe forgot to remove the protective plastic on it? I know of another member who did this and he had a funny smell afterwards.

Stock. And even if I had done something like that would I seriously admit to it at this point? ;)
 
Did you recently paint anything, change/top off fluids or change out brake pads? Grasping at straws at the point.
 
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Hopefully we'll find out something. Not guessing any light will be shed on the odor in question, though.
 
Forgot to report. While no source for the smell was ever found (and hasn't happened since) they did discover that my transmission cooler had bought the farm. They replaced that and it has been smooth sailing since. No more temp problems.
 
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