My head has popped: vibration after lift question

I have the dreaded vibration. Started after a 2" lift-Gen 3 struts and a spacer up front and HS AAL's in back. Read the threads... okay, so is it just this simple:

1. Make sure the top angle at the transfer case is the same as at the pinion (or complimentary angle if using the other side of the 90 degree angle)
2. Make sure the two halves of the drive shaft are at the same angle or on the same plane etc.

Is this the solution in a nut shell? I understand that this entails shims and such to achieve
nirvana and the crux is how many degrees of shim on the axle...

Thanks! (I will surely enjoy the coming abuse...)

 

Does the vibe go away when you engage 4Hi?

Front diff needle bearing is a real common source of vibes in these trucks after a lift.

 

Best place to start would be a
one piece driveshaft.
After all the wasted time with shims, angles, and carrier bearing drop spacers, the one piece driveshaft ended all vibes.

 

Technically. You want the middle and rear u joint to be at equal and opposing working angles, and the front U joint close to zero. You have to factor in axle wrap at the pinion and how that changes its angle under load.

 

nd4spdbh, what do you mean by a "working angle"-is that what I am interpreting as the complimentary angles? Can you explain this?

Pat

 

Working angle as in the angle of the joint itself while the truck is at ride height. (use angle finder to measure both sides of the joint, typically you will zero out on one side and then move the angle finder to the other and boom working angle)