Wow, I apologize for the misleading information I gave the OP!!! I must be more careful in checking the "Location" of a user before I reply to their post. Thanks, lmf, for pointing that out!!
P.S.
Did you notice if that "LS" model on the Australian webpage indicated the locking differential tranny. If so, at least all of my info wasn't wrong:0)
I'll take a look see.
P.S.S.
OK, the YTH22V42LS is not on the website and the YTH2242TDRF(that your link goes to) actually does have the locking differential(may be why "DRF" is in the model#). However...going to Support on the Australian website and entering the YTH22V42LS model does come up with what looks to be a 2008-2011 model owner manual(that still may indicate a discontinued/leftover stock model). Below is a link to that in case that will help the OP:
http://www.husqvarna.com/ddoc/HUSO/HUSO2011_AAaa/HUSO2011_AAaa_YTH22V42LS_532445144.pdf