I understand lockers and posi having run quite a few off road vehicles over the years. I know the VX rearend isn't a locker, but in many cases where mud or snow were involved, spectaters noted that both rear tires were going at the same time. Or like on slick surfaces where the rear end can be kicked sideways, similar to what a locker would feel like, rather than on open diff where only one tire loses traction so its harder to get the rear moving around. It was in four low, but the noise deff. came from the rear, not the transfer case which is a bit noisy (gear driven?). Does the brand of the limited slip addative matter? I picked this stuff up from parts plus that said it met the standards mentioned in the owners manual. Scary.