After taking my old diff to a local friend and toyota mechanic, he told me that the gears were set up with too much backlash. And that under load they can fail easier that way.
Good job toyota :doh:
On a side note for those who care.. the truck is naturally aspirated again, it has the new diff in, I have a set of stock 5 star wheels and am looking for a cheap set of 265s in town, and I have a set of 99 suspension coming soon.
All that needs to be replace before sale are:
-rear tail lights (stock ones for 01-02s) Mine will be for sale soon. They are the Smoked LED ones with one side being kinda broken.
-Replace some burned out LEDs in the dash
-Replace brake pads and install an anti-rattle kit I should have had years ago..