I just measured mine. '54 w/six cylinder/auto. From the center of the rear U-joint to the center of the front U-joint is 53". Add another 5-3/8" from the center of the front U-joint to the end of the slip yoke for a total of 58-3/8".
Am I correct in ***uming that all of the '54 Ford driveshafts were the same length regardless of the engine, transmission or body style?