So as you know the sas is done and so I was able to drive it for a bit. About 2 days ago when I drive down the street at a speed(human running slow speed ~5-10km/hr) I can hear a noticeable vibration that has a pattern to it. It sounds like if I had huge 44" knobby mud tires making noise but almost like a binding sound. When I checked the angles of the transfer case drive shaft and the angle of the rear pinion they were out by 2.5 deg. Because of this I added 2.5 deg shims under the leafs and that corrected it. Right now the rear pinion and front transfer case angles are at ~ 5.8 deg each. The drive shaft was lengthened, balanced and u joints inspected for the sas project. Right now I am puzzled because it never did this when it was stock. If anyone has any suggestions they are welcome. Thanks.