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Its a pretty penny but Mobil makes a "75W 140" pure synthetic oil that would work year round and when hot will act as heavy as anything out there without sacrificing cold performance. I think it is a really ridiculous $15 a quart IIRC! Hope that helps.
It is doubtful that your ring and pinion is making noise.
It is far more likely that your pinion bearing(s) are the source of the noise.
Running heavier gear lube will not solve anything.
I run 75-140 in rigs I expect to leave it in... and whatever I have on hand for rigs that see a lot of changes due to water contamination (these rigs also do not see a lot of highway miles or any towing duty beyond a loaded M416).
Mark...
Mark...
Wonder if anyone has used gear oil heavier than 80W-90 in their differentials and what they've noticed if anything??
Running heavier gear lube will not solve anything.