This has been covered and I did research but still no answers, so... When installing a lift kit, 4 inch, I have read that the original washers/spacers (4 bolts holding the transfer case cover) need to be used on the bottom of the case when installing. I'll try and explain so bare with me... Because the clutch has been replaced over the years, of course, some shops never put it back together correctly. The original bolts, washers and nuts have been replaced so I have no idea what size the original spacers were. Reading on this site at times, the advice is, use the spacers that are on top of the frame holding the cross member and install them on the bottom for the lift kit. Having said that, I only used 3/4 inch spacers on each hole for lowering the transfer case. Rancho sells a lowering kit so I just made my own. If I had used the original spacers and the Rancho 3/4 kit, what would have been the total amount the transfer case was lowered? I have a wicked vibration coming from the drive shaft when letting my foot off the gas going forward or backwards. I think the problem is the transfer case is lowered incorrectly causing the driveshaft to be at the wrong angle. Too high or too low. So I play around with trying different heights! Hassle! Can some of you tell me how much the case should be lowered. If I am off a 1/4 or so of an inch, does that cause the vibrations? Clutch is new, fly wheel resurfaced and this problem did not happen before installing the lift kit. Thanks!