I'm with you on this Tsuru, you'll blow up this tranny if you do as mentioned.
The centrediff is not supposed to handle that much power in the way you discribe.
There is another way to do this, almost bullitproof.
You have to split the gearbox of its rear drive and make it 2WD.
There are aftermarket "nuts" to lock the rear output shaft but there is a cheaper way tot make this happen also.
You take the centrediff apart and weld some parts together to make the same locknut as mentioned above.
LOCKNUT and more: http://www.subarugea...m/Products.html
DIY locknut: http://www.914world....howtopic=104513
I hope this helps.
Cheers from the Netherlands,