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Message: <blockquote data-quote="OldZeuski" data-source="post: 1581456" data-attributes="member: 31288">I appreciate the input. I guess I need to mention everything that's been done on this thread. I've been asking a lot of questions and mentioning bits and pieces on multiple threads.Specific to what you've mentioned. I've replaced the entire rear suspension: control arms, springs, shocks, axles, bearings and all differential bearings. I've also replaced the driveshaft with an aluminum one and new U joints (balanced at a shop). And I have new wheels and tires balanced as well. The trans was rebuilt a few weeks ago with everything but the gears and shafts. My pinion angle is now within 1* of the trans after I installed and adjusted new lower control arms. But still, the vibration exists and gets terrible around 100 mph. Before my adjustable LCA's I was at 3.5* difference between the trans and pinion. I thought surely that was my problem but it did not improve anything.I don't feel anything in the steering wheel and only marginally in the seat. But this vibration is intense the higher I go above 80. I have an arduino and an accelerometer that I'm going to try and rig up to either shifter or the axle housing and see if I can data log the exact frequency of the vibration. I know there are frequencies that correlate with different pieces of the drive train. I'm still convinced this is an alignment/angle issue because literally everything is new and tight.</blockquote>