Keep blowing rear diffs

[2ndhandyotaman]

I think he means that all of the u joints in the rear driveshaft are aligned to each other in case the rear shaft was taken apart in 2.

Curious if you have checked the pinion just by grabbing the pinion flange are trying to move it around? It seems odd that you'd get 3 bad 3rd members in a row, although anything is possible.

 

[Makitso]

Here is a good video on driveshaft u-joint phasing:

https://www.youtube.com/watch?v=dt69zYAcXME

 

[jman11788]

Well today I drained the all the fluid and refilled it with redline 75w90 and the noise seems to be completely gone after driving around town all day. I cant hear a peep. I'll see how long this will last and praying hard it doesn't come back. I'll update if it does!