Updating this if ever someone with the same problem has the same problem.
Just did a full fluid change:
H-tech 100 plus 0w20
Motul Gear 300 75w90 for the transmission and rear diff
And the noise has not really gone away (Shifting feel however is much better!). My old transmission oil was still in pretty good condition. However my rear diff was pretty dark and had a lot of sludge stuck to the magnetic drain bolt.
I just got used to the noise honestly. You can only hear it on low rpms with the windows closed and no music. Just gunna assume it's nothing unless it gets louder.
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