That's a 350L 4x4. The 4x4 and 2x4 were specific models that had the low range. The Trailboss didn't. Models were: 250 2x4, 250 4x4, 350L 2x4, 350L 4x4 and the Trailboss (which was a 250). Link

But they were all the same thing except for the low range and 2 or 4 wheel drive.