Well, my car is not ready yet. I bought the Motive install and bearing kit from AM, but it turns out that it doesn't include axle seals, I had no idea. My installer is grabbing some today for me so it should be good to go tonight. But as of now, my car is up on a lift with the rear end hanging out of it, lol.
Anyway, as it turns out, he also recommends a bit of a break-in period for new gears. As far gear whine goes, you don't worry about that in a drag car - you wouldn't hear a thing anyway. And the gears used in some of those cars (he's currently running 4.88s in his, used 5.13s up until last year) are usually stronger and less prown to reacting to heat, etc.
And as far as wearing them in on a street car, he also recommends the hear cycle thing. He didn't use that term, but it was generally the same idea. He recommended that after I leave his shop, drive home normally (not aggressively), which is approx 20 miles or so, and park the car for a good hour. Take it for another good drive afterwards (or tomorrow), let everything get nice and hot, and let it sit again.
By that point, it should be good to go for any type of regular commute - stop and go, long distances, extended high-speed drives, etc - but give it about 250 miles before you really start slamming it.
I know for a fact that this guy is a great mechanic, so I'm thinkin' I might do what he says. At first I was skeptical about the need for a break-in period, but maybe it couldn't hurt.
2007 GT - vista blue/black leather/auto/3.73 gears/CnL Racer CAI, SLP Powerflo axelbacks, tuned by Bama!