Eaton ELocker Differential Porsche ZF IFS 37 SplineThe 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 2004 2006,2008 2010