Getting a shake when you hit the cruise control would tend to implicate the ring and pinion. Drive shaft or wheel shake would likely be constant regardless of throttle position.
The service bulletin I posted a link to suggests driving with the rear propshaft out if you have a four-wheel drive truck to eliminate the driveshaft.
In order to pin down the root cause, the first thing that has to be done is to determine the frequency of the vibration. If the dealer hasn't bothered to do that, they're just swapping parts and you'll never get your truck fixed. Show them the service bulletin. Ask them if they've put a scope on your truck as called out in the procedure. That scope costs close to three grand; if they're a small dealer they may not even have one. But that's the only way the problem is going to be isolated.
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