Ahah no problem! Sorry for not replying 'till now! Well it would shorten all of your gears so they become useable for the most part. As for turbos I'm not sure but i'd say you'd be ok as I believe the topspeed with just the 4.75 is around 210km/h depending on tire/wheel size.Sorry for bumping an old thread, but i think the OP would be able to bring some knowledge to us. I'm currently looking into purchasing the 4.7 final drive, but I'm looking for some more info. How would i benefit from it for time attack/circuit racing. The gear calculator is a bit confusing, so I'm looking for proven use. I figured a pm wouldn't benefit anyone else, so hoping for your insight.
The car will be a bolt on zetec for now, and eventually a turbo.