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May all problems be solved thusly... Congrats!

You are correct. And the TMs DO NOT call for additive. I only put it in after strong recommendations from this board, knowing it would, at worst, do no harm... The unit is working great. Like you I doubt if the additive is doing much except possibly increasing the longevity of the fluid...

In my experience the gov loc is pretty transparent if the fluid is good. Occasionally under load on turns I'll notice it a bit. But even that has diminished since the fluid change. And it works locks up tight as a drum with wheel slip. I don't drive with any special care. Just normally and...

Check the fluid level. And use a limited slip additive. Preferably GM brand (even though the TM doesn't call for that.) Try the cheap, easy stuff first. Although reviled by serious off-roaders, I really, really like the Eaton Gov-Loc and have no trouble with mine. Age and condition of...