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Received reduction gbox, oil cooler hoses, and radiator hoses yesterday 5/15/12. In order to install radiator, had to remove a section of lower bell housing, in particular, the pad where the rear radiator support attaches. This was confirmed with Viking. Had already installed gbox when I discovered the problem. Had to remove gbox and flywheel to access area.
Now my block matches the Viking gbox install video here. (go to 7min:20 sec)
Also installed oil cooler and routed hoses.