Eaton ELocker4 Differential Dana 44 Front 30 Spline 3.73 & Down Ratio 19977-010 Eaton ELocker4 Differential Dana 44 Front 30 Spline 3.73 & Down Ratio  The ELockers electromagnetic locking mechanism is the next generation of aftermarket differential technology. Performs as an... MSRP: Was: Now: $1,374.99 Add to Cart The item has been added