Jim,

Do not mistake a Powertax for a limited-slip unit. A Powertrax will turn your rear dif into a locker....big difference. The locker, as the name indicates will lock both rear wheels together nearly all the time. Advantages of a locker: ultimate traction (of supreme importance in the Jeeping world) In the Volvo street world this may not be a good thing. Lockers can be noisy. They can jerk a vehicle around in corners. they wear tires faster. Lockers will tend to push your car forward, even if your wheels are turned. This is especially true in winter conditions. Icy road conditions and a locker are a dangerous combination. Being an old Jeeper for 15 years, I know this product well. If going in a straight line as fast as possible is your only game, go for it. These units are very durable. I have used them for nearly 10 years in my "off-road only" Jeep. I have yet to break one or wear one out. I run tires that are 36 inches tall X 13 inches wide, which gives you an indication of the stress I put them through. On the up side, if you don't like it, you can remove it, return your rear to stock, and sell it to a Jeeper in an afternoon. By the way the Dana 30 has been used in the front of Jeeps from the late 60 till today. If your Volvo is a grocery getter and an everyday driver, you'll probably hate owning a locker. There are many excellent true posi-traction (limited slip) units avaiable for a Dana 30. Power transfer with a posi is seamless and winter driving is hardly an issue. They are more expensive and installation is best left to the pros. In my Jeep, it's lockers forever. In my brick....never.