Regardless of any other factors, I mentioned this to you when we chatted. This stuff is a real pain in the ass for shops. You can spend countless hours that you aren't sure will be paid for and even if they are paid for, it isn't comfortable to charge someone for that much time with sometimes no change for the better and often times change for the worse. I don't blame any shop that throws in the towel or lags on a project like this because there is little about it that doesn't suck.
We are shooting blind with stuff like this with only experimental solutions based in experiences that gives us places to just start to make a difference. That and it is very hard to disrupt a tight schedule of other rigs that have known solutions to be applied to them in order to get them out the door.
Not picking sides, but I can easily understand the issue.
I have the exact same vibration as Sri does Blaine. We drove our Jeeps back to back on the same day, and the only difference at all is that mine comes on at about 60 mph, whereas his comes on at about 40 mph. Of course mine is geared to 5.38 with 35s, and his is geared to 4.88 with 32s. Either way, both of our issues didn't present themselves until after the re-gear.
The shop who is installing my Savvy mid-arm and outboard shocks on Monday, told me that they are very familiar with this vibration (he even described it in detail as a harmonic and cyclical vibration) and he said every time they see it, it has to due with the driveshaft spinning at a faster speed from the re-gear, and needing to be balanced a particular way.
He told me he is very confident that their go-to driveshaft shop here in Dallas, Oregon can fix it, as he's fixed all the others. I wish I had gotten more details, but he really seemed to know what was going on, so I figured I'll let them check it out.
Obviously I remain very skeptical about this, since I know that Sri had his driveshaft balanced after the re-gear, and they said it was just fine.
Either way, I told my shop to take both the driveshafts out (front and rear) and send them to their guy, just to see if he finds something that someone else hasn't. I suppose it never hurts to have a second opinion.
Anyways, we'll see. I'll report back with what (if anything) they find.