the gears are the same as an NA (ring gear diameter of 200mm). That wouldn't be possible to install in a 230mm set-up. And there is a shit load of gear ratios available from Nismo for the R200 set up. Oh well, continue on with my original idea, I've done my homework and there are no lower ratio gears produced anywhere that can be installed in the TT rearend. Thanks for the info though, Mark