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Strange S-Trac Differentials

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Finding the right differential is often an experiment in compromise--spools, lockers, and limited-slips all have their pros and cons. Strange S-Trac differentials u

Finding the right differential is often an experiment in compromise--spools, lockers, and limited-slips all have their pros and cons. Strange S-Trac differentials use helical gears for optimum strength while retaining smooth operation similar to a posi. Unlike standard limited-slips, there are no cones, springs, or clutches to wear out; the preloaded 35-spline unit's helical gears are constantly adjusting to the conditions, resulting in positive traction even around turns. Under normal conditions they operate like an open differential, but once slippage occurs a force is created between the pinion and side gears whic

Finding the right differential is often an experiment in compromise--spools, lockers, and limited-slips all have their pros and cons. Strange S-Trac differentials use helical gears for optimum strength while retaining smooth operation similar to a posi. Unlike standard limited-slips, there are no cones, springs, or clutches to wear out; the preloaded 35-spline unit's helical gears are constantly adjusting to the conditions, resulting in positive traction even around turns. Under normal conditions they operate like an open differential, but once slippage occurs a force is created between the pinion and side gears which generate friction, slowing the spinning tire and sending power to the one with the most traction. When power is applied, it wedges all the gears together so the wheels will spin in unison. Their surefire grip is especially useful on curves and corners where both tires receive power, as the inner differentiating allows the racer to hit the throttle midway through the corner and set up for the straightaway. The case halves and internal gears of these S-Tracs use high-rated case-hardened steel--with multiple massive pinion gears to control differential action (6 with Dana 60, STR-D3523; 12 with Ford 9 in., STR-N1980). These differentials do not influence vehicle steering, and have no perceived backlash. No special friction modifiers or additives are required. Whether using your vehicle for street/strip, autocross, road racing, circle track, or off-road, Strange S-Trac differentials will pull you through.