Transmission Rattle

[Tahdig_siah]

I recently dropped the skid plate, replaced transmission oil (used MT90 Redline) and bolted it back up. On the first startup, I noticed a rattle in my transmission in idle. It is pretty loud and can be heard inside. 2000 TJ Manual 2.5L. (note: I had dropped the plate previously to replace the downstreatm O2 sensor without supporting the transmission properly) but like I said I notice the rattle after transmission fluid change.

 

[Tahdig_siah]

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[fourpointzero]

Sounds more like an exhaust leak.

 

[ColoJeep]

It appears that the T-case is really moving/ shaking around more when it should. I would take a hard look at all the mounts and related bolts/nuts.
Also take a peak at the exhaust system and what it might be contacting . Good luck in your search !