dsm guys......awd question

NYSpeed Automotive
5

found one on ebay, but im confused by it now:
http://www.ssb8.net/users/35409/dsp_transfer_case_001.jpg
http://www.ssb8.net/users/35409/dsp_transfer_case_002.jpg
http://www.ssb8.net/users/35409/dsp_transfer_case_003.jpg

the hole for the shaft up front doesnt go all the way through like i thought it would…how does this work?