Scooby see-Scooby do

iTrader: (3)

Hi, sorry if I'm repeating questions here but I spent hours reading through all the info on offer here - many thanks to everyone for posting valuable advice - and checking tranny charts (although I was a bit scared to at first lol)

Do I just need to change the rear diff to match the gearbox or do I need front diff too?

I have a 95 wrx, I haven't checked the code on the box but everything was standard when i got it 3 and a half years ago. I'm planning to replace the broken box with a ty754vb and matching rear diff from an sti 5/6.

Is this all I need to do? ( untill I up power from 340bhp/320lb to 400+)

Thanks