3in lift vibes

I just lifted my truck 3", I don't have a SYE and didn't drop the transfer case. After the lift I have a slight vibe when I'm on the gas, would this be because of the drive line angle? and will this destroy my u-joints or anything else?

could I just need a shim to angle up the diff?

I've now put on some 31 MT's and can't even feel the vibration over the tires.

so today I put in a 1/2 inch t-case drop, hope this will be enough?

thanks

Sounds good to me.

I'd do the shim thing and if that didn't work, you may have to go with the SYE and new driveshaft.

so the vibration is normal?
I might try the shim also

thanks

yes

I also have a vib between 20 and 40 mph after a re 3.5 on my 98 xj. I did a transfer drop and it went away. but I have shims on order and if that doesnt work im doing the sye and driveshaft.. I just dont like the transfer case sitting low with the drop