Thanks for the advice some of you gave me on my driveshaft vibration problem...last week I installed my 4" lift and the bla...ah....jimmy looks great. I had a slight vibration at 30-40 mph. but hell...was it something else? you know your speedo is not right after the lift. anyway...I droped the xfer case down using the gm spacers on the xfer case xmember. It works like a charm and no worries now. Cheapest mod I've ever made. by the way...where can I get a grease seal for my front driveshaft? when I dropped the front axle to install the new springs you could see my driveshaft splines...the seal broke off and now I need to keep that grease in. I'm asuming it's easy to put back on. but you know what happens when we assume. 1990 GMC Jimmy 350/TH700R4/NP241/10 bolts, 4" skyjacker lift, 35x12.50R15 BFG All Terrains on 15x10 AR Baja's, Flowmasters.