I have this issue on my rb20det manual box, I have had the box off and checked the clutch, also replaced the thrust bearing, noise is still there, it's definitely the box, slows down and stops once foot is on the clutch, noise occurs in all gears, although isn't overly noticeable in 5th but that's probably due to wind and road noise. - does anyone know anyone in the Brisbane region I can take my box to to get fixed? - or is it easy to do yourself?