Drivetrain 8.8 Rearend Guru's. Identify This Sound

Dec 5, 2006
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got some gears installed last year and having trouble identifying a noise from the gears, i get a popping sound and squeak from the rear , i uploaded a video of what's going on here.


View: https://www.youtube.com/watch?v=oBaDBtekGXk&feature=autoshare



View: https://www.youtube.com/watch?v=FUiRWeIUmiw


A shop in town did the work and swapped out gears, bearing and 1 new axle due to pitting along with new axle bearings, i now hate driving the car with all these small noises going on and have had the car back and forth, now i,m debating on going some where else, to me this might sound like a pinion bearing but honestly i have no clue.
 
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