I have a v8 fairlane and I want to know the exact same thing! Mine currently has a 3.27 LSD...I was thinking 3.7 or 3.9 gears...it currently runs at about 1800 at 100...with 3.9s it would run at about 2200 ish at 100kph
(to work this out, find percentage increase in gearing, add 1, then times by your current revs at 100/110/whatever)
As for gain acceleration, no real way to work it out expect in real life...
So yeah, what do you all think......I would really like 4.11s but that would prob rev to hard on freeway...car is auto btw
Also, anyone got any good recommendations on places to go to get quotes/advice etc?