You will get vibes if the pinion ujoint angle is anything besides 0º, and these vibes will eat the double
cardan joint as well as
transfer case bearings. I recommend cutting and rewelding the spring perches, it's easy to cut them and set it up if you have somebody that can burn them in for you.
I 'thought' close enough was good when my shims had my pinion-driveshaft angle close to 0º, boy was I wrong. Smooth as silk now that it's corrected.
Consider cutting/hammering the tub for clearance if you want a belly-up without the recommended bodylift height.