Hey bro,
at 5,000k's i usually do the engine oil, oil filter and run some injector cleaner....usually check the brakes...
Repco....if ur running turbo brakes....r33,r34.... $80 for front.....$80 for rear...best price on the coast... but i would go on www.justjap.com and get them there...bendix has always pulled up well. wink wink...speaks in code to also hide from ato...lol
As far as gear box, diff etc.... diff will cost you $70 will premium oil.......gearbox around the same.... engine oil $90......
Cheers...