I just picked up a 93 coupe, and it has a j30 vlsd. Does this affect the speedometer? It does also have 18" wheels on it with 245/45 tires on it, so I know that affects it some. Main reason I'm asking is because either my speedo is acting funny (as in reading way faster then I'm actually going, which wouldn't make sense with bigger wheels, they would make it read slower) or this things a lot faster then I expected it to be. At about 6k rpm 4th gear I'm at around 100mph. (on a closed course obviously
) So my question is would the j30 affect my speed and make it read way off, or does that not make any difference?