LukeFranky

You have two separate parts there.

The first is the differential pressure sensor. The second one with the dodgy wires hanging off it is a boost gauge sensor.

You should check that differential pressure sensor has the correct vacuum lines attached to it and that the boost sensor install hasn't introduced a vacuum leak.

I missed this one. I have done this and as you said it was easy. Did you have to grind out some of the casing to fit the fatter LSD centre in? Apparently LSD casings have some relief done at the factory. Also did you notice any cracking in the machined off welds that hold the suretrac casing together? I re-welded mine as they were cracked all along their length. I think they just stop the parts unscrewing anyway so it probably didn't matter anyway.

I did have to grind a little knobbly bit off right at the back of the diff, but apart from that everything fit nice.

I didn't notice any cracks. Should I be worried?

People use auto shafts cos the impreza ones dont fit, not cos theyre good enough. If the oem spec shaft is available thats the best option imo

I'll see if I can find one. If I can't, do you know if a hawkeye auto tailshaft is the same as a bugeye auto tailshaft?

Better off getting a bugeye sti tailshaft. 

Why? Auto shafts seem more available.

The auto shaft stood up to the punishment on the B4.

You could split both boxes and do a diff ratio swap.

+ 1. I've just done this. It's fairly easy.

Never mind. Just realized he meant the gearbox diff, not the rear diff. The gearbox is harder, but doable.