2005 2500HD 4x4 Gasjob... Just changed gearbox, hoses, and pump. Whines when it turns to the left at parking lot speed, and a little when driving down the road. System has been flushed with fresh fluid. Buddy owns the local Napa. He's says its not unheard of that the reman pumps are bad out of the box. Any suggestions before I pull the pump again?

 

sound like air in system to me.is oil bubble like air in it?