What's wrong with my 300ZX's gear ratios?!

[PS]

First Gear: 1.99.......................................................... 94mph
Second Gear: 1.39..................................................... 134mph
Third Gear: 1.04......................................................... 176mph
Fourth Gear: 0.89...................................................... 194mph
Fifth Gear: 0.82.......................................................... 198mph
Final Drive Ratio: 3.40


I know the fifth one seems a little short, but anything longer and I won't accelerate at all!

If it helps, I have 606hp. All PRO engine mods. And tranny, clutch, weight etc.



..Or is the car supposed to gain only 4mph in top gear?

 

[MagpieRacer]

odd, have you tried ramping up the final drive?

 

[PS]

odd, have you tried ramping up the final drive?

I've tried lengthening and shortening it, but the only real difference I see is around 1rst and 2nd gears, which are already pretty high just to avoid wheelspin.