A wire cable assembly includes a terminal having a termination segment attached to an end of a wire cable, a connection segment configured to attach to a mating terminal, and a transition segment intermediate the termination segment and the connection segment. The transition segment of the terminal has a generally rectangular cross section and a recess defined in at least one distal edge and preferably both distal edges of the transition segment. The recess may alternatively be characterized as a concavity, notch, hollow, or indentation. A sealant is applied to the transition segment and a sleeve encloses at least a portion of the termination segment, the end of the wire cable, and at least a portion of the transition segment. The sealant fills the recess(es) and blocks a leak path between the sleeve and the distal edge. The sleeve may be a section of dual wall heat shrink tubing.