When does your vibe show up? Is it on take off, or as you get faster? If it's just on take off, check the condition of your transmission mount. If it is at higher speeds, try dropping the t-case by a couple of washers.
What may be easier is just to add enough washers so you get 1/2" of t-case drop which should get rid of any remaining vibes. If you have the energy later, you may remove a washer or two to see if you can get rid of some of the drop without causing the vibes to return.
Whether or not a 1" motor mount lift, t-case drops, etc. get rid of vibes entirely depends on what rear axle you have, what transmission, etc. you have since all of those affect the driveshaft length. The shorter the rear driveshaft, the more susceptible it is to vibrations.
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