I think a little bit of whine is normal.
A buddy has a Turner built 4.10 (assuming it is a diffsonline) whines...has been whining for 14 years. Long story but we swapped in a V2 unit and then a ZF...ring gear and pinion looked immaculate. Drove another car with a Dinan 3.91 which whined. I'm pretty sure both cars have OEM bushings.
I've had a 3.73 and a 3.91, both REM polished. I can't detect a whine even from in-car footage but my car is quite loud too.
A buddy has a Turner built 4.10 (assuming it is a diffsonline) whines...has been whining for 14 years. Long story but we swapped in a V2 unit and then a ZF...ring gear and pinion looked immaculate. Drove another car with a Dinan 3.91 which whined. I'm pretty sure both cars have OEM bushings.
I've had a 3.73 and a 3.91, both REM polished. I can't detect a whine even from in-car footage but my car is quite loud too.
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