can you DIY rebuild a std diff to make it very aggressive?

i have a spare 4x4 rear diff, that should mine break, will be getting welded.

i was sold 4x4 rear diff/beam/shafts etc as 2wd by some joker off here and dont have the funds to get proper 2wd stuff yet.

so ill see how long it lasts, but i do have a spare.