Here is a little info for those with vibes.
If you retain your original drive shaft you need to check how far out the slip yoke is after the lift. If it is too far out you may lose the shaft on the trail while the suspension flexes or it may go far enough out and then snap.
Solution remeasure the length and have it fixed or lengthened.
For the vibes you can go to Tom Woods home page at Tom Wood's Custom Drive Shafts - Tom Woods Custom Drive Shafts Custom Driveshafts Specialist
and go down the right side to the grey banner under technical information and Sponsorships. Select Technical information and go to the header for Geometry 101.
Without a SYE installed the angles are different and with your current lift from whatever company you need to determine the angles with a magnetic angle finder found in any good hardware store or Harbor Freight. Without the SYE the rear needs to be parallel to the T-Case output.
With the SYE installed you want to be 2-4 degrees lower.
It is illustrated in the article.
When I installed my lift I had the vibes and felt like I ruined my YJ. But I found the supposed to be 6 degree shims were actually almost 9 degrees. I went to 4 wheel parts got some 6 degree shims and I was good to go.
So read the article and understand what happens when you lift, when you install a T-Case drop or a 1" motor mount lift. They all have an effect and there is no magical formulae. You have to do the angle measurements and get the pinion angle correct and the vibes should be gone. At worst they will be so minimal you almost don't notice it.