i need a indestructable rear diff, please help

[Just go Play]

LOL, I'm not going to comment on the retard thing but I personally do not think that the choice of a 3905 cup would make a bit of difference. The spider gears are not the weak link, it's the plastic diff cup that would flex and allow the cross pin to move around allowing the spider gears to bind and fail. The aluminum cup fixes that problem so on that point there is now difference between the 2. The only advantage to the 3905 cup IMO is that they have seals.

Ok now for the retard thing... why would you pay over $100 for a single diff setup that used stock gears when you could buy a far superior 1/8 setup for the same price? Your not even getting the advantage of having combined bulks (which I found to be one of the best upgrades I ever made on my emaxx) and diff cases that would help justify the price...

If you need diff oil let me know I have enough weights to mix about any weight you decide to use.