I'm going to add one comment- it just seems that any component in the driveline would only have to be out a minute amount to cause the vibration issue , and it would most likely be in the ring and pinion and carry up the shaft if not the shaft .
I regeared my O3 Rubicon to 4:56 and did a crappy job basically - got a vibe at 63 mph that disappeared when I yanked the front shaft .
It's in the shop now - getting guess what - new gears by a professional.
The head guy contacted me and told me my ring and pinion was hammered .
I bet when I get it back , that vibe is gone as well as my other issues .
I know so little I probably shouldn't be on here throwing out guesses , but in my opinion these are likely coming from the differentials , and anything else you do just alters or mask it .
I regeared my O3 Rubicon to 4:56 and did a crappy job basically - got a vibe at 63 mph that disappeared when I yanked the front shaft .
It's in the shop now - getting guess what - new gears by a professional.
The head guy contacted me and told me my ring and pinion was hammered .
I bet when I get it back , that vibe is gone as well as my other issues .
I know so little I probably shouldn't be on here throwing out guesses , but in my opinion these are likely coming from the differentials , and anything else you do just alters or mask it .