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Royal Purple Max Gear 75w90. Needs nothing else added. Or the GM lube with adding the GM additive. I wouldn't mix and match something that already has an additive and then add more additive. RP works great, I'd go with that.
Then go to a parking lot and do about 10 slow figure 8's. That works the additive into the clutches. If it still whines or groans after that, something is boogered up.
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