Can anyone tell me what type of diff ratios these cars came out with?I have 3.9 in mine but combined with the V8 and 5 speed this is realy unsuitable.I`m only using 2nd,4th and 5th!!I`d idealy like something around 3.1 but i doubt that ratio was ever available.....What are my options here as i realy don`t want to do a diff conversion (love the IRS).