hey mr south efrika
dont know much about toyota stuff or anything else for that matter!
the problem is the diff ratios..... 4.7 is too low for any old school gear box, they all will, when overdriven still return around
3000 rpm @ 100kph. anyway not such a problem, just wear ear plugs and cop the extra fuel bill. (or do a diff ratio swap and comprimise low range ability)
anyway, my S3 will sit on 120kph all day at around 3300rpm no problems, at this speed wind noise far exceeds engine buzz - is never going to be a shiny turd. such is series life.