In an effort to extend a line growing obsolete in the face of advances in sports car design, Allard introduced an 'improved' model in late 1951, the J2X (extended). The chassis remained unchanged from the previous J2, but in an attempt to improve handling, the front suspension's rear attaching radius rods were redesigned with forward ones, which required a forward cross member and extending the nose past the front wheels. This, in turn, allowed the engine to be moved forward , yielding more cockpit room. The nose was lengthened some to accommodate the change.