Have a good search. There is about 3 brake conversions i can think of off the top of my head. Some are only mild but well adequate for pulling up a worked 2tg, others have the ability to stop a minibus full of rhinos. Most of those brake upgrades have a good cost figure in them too so you should be able to find something that not only works but is also in budget.
As for the diff unless your giving it a caning or breaking things you probably shouldnt need to upgrade to an f series although the bigger brakes would be a nice feature. I believe Skidds has been working on getting hyundai discs onto a t series and 30psi also has a top thread on designing your own brake brackets so depending how handy you are these are some options.
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