Anyone changed gear lube in Torsen 3:55 rear end? -- What gear lube and weight? Friction modifer?

[RLE55]

Why 75w140 over a 75w85 or 75w90?

Don't necessarily need 75w140 in the a stock stang, although it won't hurt it, those diffs get hot and heat is not a diffs friend. I was mostly pointing out the friction modifier. I used 75w140 in my mustang track car with Torsen T-2R...lots of heat generated.

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[JS1951]

Sorry pics won't post. Bottom line change fluid especially since it only holds 1.6 it's and it is so cheap and easy to do.