Transfer Case/Slip Yoke Question

[NorthWolf33]

I jsut recently put a 4 inch lift with 33's on my 1990 Fullsize Blazer. I got a whole brand new driveshaft rebuilt and balanced. Now that I have finished it I jacked up the rear end and put it in gear and when I get to abou 35+ MPH there is a loud binding/grinding/rattling noise coming from right where the yoke goes into the transfer case. I was wondering if anyone has any suggestions on what this could be and how to fix it cause I am takin this for a 2.5 hour drive to college in a week. I thought about a transfer case drop kit but I dont know anything about those. It says to just drop the crossmemeber but will the transmission and engine allow for the inch of drop that the instructions want and if so will that inch fix my problems?