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Thanks I’ll give that a go . I’m hoping it’s something minor but I’ll find out hopefully one way or another. The trans shifts like butter I’m leaning more toward the rear diff or possibly the 4x4 hubs since I just replaced the driver side and not the pass side yet and my 4x4 feels like it’s always engaged no matter whatTake the serpentine belt off and run it for a minute to see if the humming noise stops or continues. If it still hums with the belt off it's probably the transmission rather than the P/S pump.