RE: A revisit surprise to me!
Floobydust - 12/28/2014 9:02 AM DUTCH - 12/28/2014 6:52 AM Have you considered replacing the rear engine mount - the one that supports the tail of the tranny? If that is worn and out of line, that could be another source. When I did this on my 280GE, there was a major improvement. Thanks for the suggestion, but I've already done that and it made no difference. In fact, at this point I have replaced every rubber interface on the entire drive train and suspension. The truck drives like a dream except for that vibration. Just before Christmas I did one last "maximum perturbation" on the transfer case where I flipped the homokientic shaft front to back and rotated in 180 degrees in the coupling flanges. The idea was to see if anything changed related to the vibration and it didn't. So at this point I can only conclude that there is something amiss in the TC itself. Thanks again everyone. Another update. This one comes with a slight vibration consideration, "Floobydust".... I thought I'd try to retighten the clamps in place, for now... Before I waste any more time on that idea, I needed to remove the small clamps and load the estimated amount of lost CV grease. I was able to slide a 1/4" poly tube/attached to my mini grease gun, between the rubber and the shaft. Now call around for new clamps, nothing available locally, so I decide to spread the old clamps and reuse them. Now onto the large clamps. I can reach the clamp ears with the pincers. I give the first clamp, "all I have", snap goes me pincers!!! Off to HD and buy a nail puller/pincer. I managed to exert much more force than before. With fingers crossed, I head for the highway. 90 MPH should give me some idea. One clamp is holding, the other is still weeping ever so slightly. I'll give it another shot soon. In the process of replacing the shaft and the TC mounts, I've developed a slight vibration as well! Starts around 55 and beyond, it migrates to the steering at times. One thing I've noticed while swapping out the TC mounts, is all the play the M8 bolt holes allow. I did my best to seat the M8 washers exactly where they where, before I tightened the thru mount bolts. Even the thru bolts have play enough to raise the TC as much as a 3/16" above resting. The exact placement of the TC, in relation to perpendicular shafts, seems to be somewhat hit or miss to me. I'm going to set up a pair of lasers on the drive shafts, hoping to see if they are perpendicular to the TC, or at least parallel to each other. More soon. | 
