How much whine is normal for a new sure grip rear end?

Can't tell by the first post,are the gears new or used ? Or was the housing complete when you got it ? When I buy swap meet pumpkins.....it's the luck of the draw. Last set(3.55 742) I got looked good,pattern and backlash correct,got a high speed whine on the drive side, quiet on the coast.Figured that having no idea how long they were or how many miles they have gone that nothing can be done.