the half shafts are the main problem in them most the time if u replace them it goes if not well it something a bit more the half shafts from memory are abot $400 each
i bourght a 5.0ltr exec ex pursuit wid 150kms on the clock three months ago i paid $13000 i just put a twim manta exhaust system on it and it does 255.6hp at the wheels so if u can find a ex chaser buy it