i've had them in a few cars and never had a problem. just remember it's there and drive accordingly. since you want to know what gears you have, just change the fluid and find out
You're talking to someone who knows little to nothing about rear ends. Even if I open up the rear end, I would not know how to figure out what gears I have unless there was a sign in there that said 2.91 lol.
Anyone want to give me a quick lesson on rear end for dummies? Or maybe refer me to a good website for this kind of information...