Will a 6x9 speaker fit in a 2004 yukon?

Yes, a 6x9 speaker can fit in a 2004 Yukon, but it depends on the specific location where you intend to install it. The front and rear doors of the Yukon typically accommodate 6.5-inch speakers, so fitting a 6x9 speaker may require modification or an adapter. Always check the vehicle's manual or consult with a professional for the best results.