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10 Our differential of choice for the High School Hauler project is this Yukon Gear & Axle Dura-Grip. The Dura Grip is designed similar to the Ford Traction-Lok, but uses a nodular iron case half filled with forged internals, composite clutches for superior life, a high-bias spring, and a billet steel side hat. Available in 28- and 31-spline versions, we opted for the 31-spline version. Randy’s Ring & Pinion can build your center section with several options; just call to discuss your needs.