I would like to add it to diff oil. How can I find out if it can be used?

Please contact the manufacturer's mechanic,
Internal structure
Is LSD mechanism, diaphragm, friction disc, etc. attached? I heard that
The answer is that bellhammer cannot be added.
No answer is the configuration of pinion gear, side gear and ring gear.
If there is an answer, it is recommended to add about 10%.