new leaf springs are changing differential angle

[aggiedave98]

I bought 2" lifted superlift springs for my suburban lift. Now, I'm getting driveline vibration. I'm convinced it's because the springs have a metal piece at the axle that looks like a doorstop. It angles the differential upward and makes it so the driveshaft is almost straight with the differential and therefore the u-joint is almost straight.

On the other hand, the upper u-joint by the carrier bearing is obviously at an angle.

From everything I've read, you need the same angle at both ujoints to cancel the vibration.

Why do the springs do that?? If they had a flat bottom instead of the "doorstop" shaped piece, I think it would be fine.

Do just the superlift springs do this? Do I have any options??

Thanks!