Eaton Elocker4 Differential 27 Spline 3.54 Ratio Dana 30The Eaton ELocker is an electronic, selectable differential designed for drivers that need traction on demand. At the flip of a dash switch, drivers can go from open to 100 percent locked. A second flip of the switch deactivates the unit to resume normal driving. The ELocker is the most reliable on demand differential, featuring selectable operation and net forged gears for added strength. This Part Fits: Year Make Model Submodel 1966 1971 Ford Bronco