The powertrax is a limited slip vs a locker, which does just that, it locks the rear end. Lockers are better for off roading when a wheel leaves the ground the other will spin to keep you moving. Limited slip is good for the street. Decide which is best for you. There is or was a powertrax for sale here. Check that section to see if still available.
<a target="_blank" href=http://www.tacomaterritory.com/~faqsection/>http://www.tacomaterritory.com/~faqsection/</a> You are 4wd right? On the left side scroll down to drivetrain, choose gears. There is a chart.