As Aaron comments, Series 3 lwb chassis (except some early ones) are made from two pressed bits with a seam in the middle top and bottom of each rail, where earlier Series had the chassis made from four flat plates with a welded seam on each corner. The gearbox is less of an indicator, as they are easily swapped.
So if it has a seam in the middle of each rail, it is Series 3. If not, it is probably Series 2a.
John



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