maybe OP blew the engine though   
  
so 24 man hours to swap... pmmmm that's a lot of monies in cost for soft services.. 
  
  
If you can do a diff swop out mate then you will manage this no problem Anders.   
So in your case labour will be free  
  
If he can find the right tools! 
  
Engine hoist?  Nooooooooooooooooooo - Anders will use a box of matches, string and duct tape.  To be sure, to be sure!