8.25 8 1/4 Rebuild and modification

The Powertrax unit is a no-slip retrofit differential designed to fit within the confines of the stock differential case. Make no mistake about it-the Powertrax is a locking differential which results in uncompromised torque splitting when locked, and then automatically unlocks when going around a corner in a normal manner. Simply put, it’s either locked or unlocked, and therein lies the caveat. There is a mechanical shift from locked to unlocked and back again. Around a corner, the differential will unlock to disengage the outside wheel under mild acceleration or disengage the inside wheel when coasting or braking. The rear and chassis will react to the change. With the Powertrax unit, extra care is required under certain driving conditions, particularly under hard braking or acceleration in corners and any time the vehicle is driven on wet or slippery roads. Like any locker or limited slip, hammering the throttle in a corner will lock the differential, and the rear will want to come around.

Since it fits in the stock “open” differential case, installing the Powertrax requires only stripping the components out of the differential and installing the Powertrax parts in their place. Because the original case is used, the Powertrax can be installed without fully disassembling the rearend and resetting the gears. It seemed like the ideal upgrade for our street Dart. The installation proved to be as simple and quick as we expected, requiring no special tools, and we were back on the road in a couple of hours. Though we could hear it and feel it while driving, the added straight-line performance made it a worthwhile upgrade.

Powertrax1001 W. Exchange Ave.Chicago, IL 60609 864-843-9275 http://www.powertrax.com