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Do you have a one-piece driveshaft? If so, this could be the issue- unbolt it from the diff & turn it 180* & bolt it back together... Sounds crazy but just may work. My drivetrain was pretty noisy when I switched to a VLSD & aluminum DS... this worked for me.
Without hearing it for myself, you should know that there very well may be a bit more noise in the drivetrain due to both rear wheels under load pretty much all the time with the diff welded and the clutch engaged... especially if you have urethane or solid bushings, pillow ball arm/rod mounts etc.
There is also something called the pinion bearing (?) or something to that effect in the diff that could maybe be causing it; but as you see by the "(?)" , I really have little/no clue there lol.
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