I can see heat being an issue if it diff'd out a lot, which would be caused by oil that was too loose. But the thicker oil necessary for this application would limit the diff action to only take-offs and maybe on-power landings. But yes, an aluminum case would probably be recommended, but then again, I ran for about 10 minutes with the stock plastic case and it was only warm to the touch. Again probably only because the fluid was thick limiting the diff action.
The idea is to have the diff basically locked unless too much power is applied.
Personally, I think it's a neat idea and might build a cheap buggy based on this. Getting rid of the front driveshaft, axles, diff, etc would lighten the load quite a bit. Not to mention allowing different layout schemes since the front will be more open. Might just be my next "Project X" entry...
