Im thinking of doing a ratio swap, perhaps to a set of 3.9s? I think it has 3.27s in it atm? Would there be a decent increase in acceleration? Ive already done all the usual mods, im keen to do the swap if it would make a noticeable increase in acceleration...

Surely someone here can answer this?

id say atleast 50kw gain... jokin
obviously you would get more up and go off the mark and the car will revv quicker meaning it will genarate torque earlier.
the only down side will me traction and $$$ for pertol.
here is a similar thread http://fordforums.com.au/showthread.php?t=84117
cheers