I have a 2012 Diamondback Drifter 1 that I am doing "something" to. When all the random parts are on it we can fuigure out what it will be.

ANYWAY; it has a 1-1/8 inch quill stem, if I were to do so, as I'm hoping, will a threadless fork just slid right in? Would I need to carry over the bearing cups in the frame or just the top assembly? Or would it just slid in and all I would need to do is remove the top nut from the cruiser so the fork slides in and just replace it's spacers and whatnot?