I would find out more about what's wrong with the transfer case and the driveshaft.
In deference to Ken, driveshafts can get out of balance for one reason or the other or a spicer failure can cause the end of the shaft to get wallowed out.
Your warranty will most likely cover this as most extended warranties cover the drive train at a minimum. You may or may not have a deductible depending on what you chose when you bought the warranty. In any case, the $1500 warranty you paid extra for might have just paid for itself. Get your information out and call the whoever the warranty is with and get the details.
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