Quote:
Originally Posted by orcking
The thing is the TSB lists up to 2019 year. Mine is 2020 so you would think that they would have put the new parts automatically, but I guess not...
Unless there is a new TSB for 2020 as well....
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So that I understand what you were originally asking, does the whine occur at the actual time you lift off throttle, or is the whine present when driving and then stops soon after you lift off throttle?
Even though the TSB does replace the diff, I think that because they also address ways to make it quieter, it means -- to me -- that it's not necessarily a mechanical issue but rather a noise issue, and the replacement unit will likely have the same noise, which they are trying to address via the first steps in the TSB.
My whine is at 65-70 but I noticed it after I installed full skids, so I theorize that there is more sound being reflected back up into the cabin. I've also read that the whine can come from the t-case as well, which makes sense, at least in my case, because the t-case is fully covered by the skid.
I wouldn't really worry about it unless the noise changes or becomes louder. There were a number of threads on this forum I've read by people having the same issues but there was never a conclusive issue found with exception of a few that did find metal in the diff oil and ended up with replacements. I drained my fluid last week and found no metal. So I'm gonna let it go.
You may drain and fill the rear diff for peace of mind, and if you find no unusual metal, fill it, close it and monitor.