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While the front Dana 44 typically needs more strengthening than a rear 44, there also are ways to upgrade a rear Dana 44 axle. For example, Superior Axle & Gear makes the Super 44 axle kit. It replaces the stock 30-spline axles with stronger 33-spline axles with rolled splines (instead of cut splines) and is available with an Ox Locker or a Detroit Locker.