Ok, I just went from a 4" lift to a 6" lift, along with installing my 14 bolt rear this weekend. I now have a pretty bad vibration coming from the drivetrain. I guessed that it was the driveshaft. So, this morning I took it down to a friend at Drivelines Inc. and he told me that the pinion angle was near perfect, but the t-case angle was way off. So, he said that the easiest way to correct this was to lower the t-case with spacers. I have heard of this a lot, but always hear about the problems with it, like the transmission, motor and radiator fan all moving as well, sometimes causing the fan to make unfriendly contact with the radiator! IS this true? I can get some spacers pretty cheap, but is it better to suck it up and get a custom driveshaft, maybe with CV joints to answer the problem? I have a 1987 K5 with a 208... thanks!