Is the head loose or anything like that?

Make sure the SureFit screw is torqued in correctly. If it is, then it could be the interaction between your glove and the grip. Other than that, no ideas...I don't hear a squeak when swinging mine at my normal swing speed.

If you are check with the surefit screw be careful. Unscrew it and retighten it. When it clicks once, stop. If you try to tighten it more than one click you can strip the screw. If that does not work call customer service or take it to the store where you purchased it and have them look at it. If you leave your driver in the trunk of your car the shaft could be slightly loose from the heat. That is why it is best to have an expert look at it. The weight of head in motion could cause plastic on graphite to possibly squeak if it were a bit loose.

Need to get it checked out by a golf professional as soon as possible. I had the same thing happen to me and I continued to play with it until the head completely broke at the hosel and I had to send it in to get it repaired.

The Titleist Warranty and Repairs Department may be reached at 800-742-7609.