You need to be more specific. A problem with the nutserts that hold the transfer case skid on doesn't warrant a frame swap, so is your problem more than you're letting on? If the only issue you have is a few nutserts are bad, you can easily fix that. If you have much more of a rust issue than you initially let on then you'll need to provide some pics so we can see how bad it is. Having problems with nutserts is very common when they aren't maintained very well. If that is your only issue, it is easily fixed in less than an hour.