I think I found something fun. I am having a hard time finding compatibility but I think this will work- can someone confirm if you know yes or no?

I found this on ebay right now. From what it appears it is the same pinion shaft makeup as the large carrier 3.67 cases in the w140.my W202 has a small case from what I can verify so this would not work inside mine. Would this fit in the w140 ? If so I would buy a used one and these new gars and rebuild it. If thisstand alone TCU will work then I would assume I can go up with the rear end ration. This would give me unbelievable gearing with very quick ratio.
http://www.ebay.com/itm/Mercedes-Ben...f0d01f&vxp=mtr