07 Sierra Pulls Left in 4x4/Auto 4x4

[jgl25]

Evening Guys,

 

Looking to see if anyone could give me some insight to the problem. Tonight it was rainy and I forgot I left my truck in auto 4x4, I was going down a hill and noticed my wheel start to shake and pull to the right (passenger side) which has never happened before. Then later backing into my driveway and noticed a slight whine from my, which I believe to be, the power steering. Before anyone asks the tires all appear to have the same wear patterns. I'm starting to get worried because I purchased the truck about 3 months ago, replaced the fuel pump on Thursday and now this happens.

Any help would be greatly appreciated. Thanks

[rjgti]

take it outta 4x4 and see what happens