Here's a video on the driveshaft problem, and the repair. In addition to driveshaft, you may have to replace the spline hub in the transfer case.
https://www.youtube.com/watch?v=yeF0X3v6cj8
There's a guy on eBay that will sell you a modified driveshaft if you ship him your driveshaft or can sell you the replacement spline and you can weld it yourself or take it to a shop to have it welded.
The front diff should be ok since it is attached to the driveshaft with a quibo, it's only the end that goes into the transfer case that has the splines. Tell the little women to stop doing burnouts with the 4.6is.