I put a 6 inch skyjacker lift in my 91 Blazer. I have a bad driveline vibration. I currently have 3.08 gears (temporary) and 35s. The vibration was worse when I had small tires (195/60) for winter storage. Its definitelly a driveline vib. it goes away when I lift of the gas. I noticed some slop in the transfer case slip joint. Its got new u-joints on the balanced driveshaft. Any suggestions? New tailshaft? Anyone replace there slip joint with an eliminator kit? HELP!