Vibration issues. HELP!

[Kay86K5]

Is your T-case and axle Pinion angle parallel with one another?

From the picture, it doesn't really look so. It looks like the output of the tcase is pointed down just a tad bit, and the pinion looks pitched up just a tad bit too. If it were me, I would shim the pinion up just a little bit so it's pointing right at the tcase output, and then put a CV shaft on there, but that's just me,

 

[Thomas Fournier]

From the picture, it doesn't really look so. It looks like the output of the tcase is pointed down just a tad bit, and the pinion looks pitched up just a tad bit too. If it were me, I would shim the pinion up just a little bit so it's pointing right at the tcase output, and then put a CV shaft on there, but that's just me,

I want to do that but I have a slip type np241 and I don't have the cash for a slip eliminator yet, just trying to make it work for now...but a double cardon is the definite future setup

 

[Thomas Fournier]

Is your T-case and axle Pinion angle parallel with one another?

Within 2 degrees

 

[skunked]

I want to do that but I have a slip type np241 and I don't have the cash for a slip eliminator yet, just trying to make it work for now...but a double cardon is the definite future setup

You don't need a SYE to run a CV.

Here is @wetoolowdingbangow rear driveshaft built by Sacramento Driveline

 

[Kay86K5]

^This...I was about to say the same thing. Don't have to go SYE to get CV shaft. Probably just getting a CV shaft even without shimming would go a long ways for you

 

[Fordum]

One quick and dirty idea, is to examine your drive shaft for things spot welded on it on the sides close to the ends. If it is a new tube, and any attempt at balancing was done, your should see pieces of metal welded to the tube.
Its not impossible for a shaft to be balanced as built, but its unlikely.
The factory seems to use metal strips, but most of the shops I have seen use washers.
They are cheap, and come in all different weights. My friend spots one edge to the tube, taps it down to conform to the tube and then spots the other edge.

 

[70jimmy]

Wife walked by and saw the title to the thread and said, "He needs new batteries."

Yep point the pinion at the T-case and be done. It helped on mine a great deal.