Is there a way to change the gear ratio on a 4kq?

[gerard]

On Thu, 20 May 2004 12:12:24 +0100, Alan Pritchard wrote
> Yep, but 5th on my 1990 90q still tops at about 135mph at 6500 ish......
> BTDT ;)

Look in ETKA for the 016 'UW' or something like that (early 80s coupe I 
think). 5th is something like 0.68:1 if I recall correctly. Diff is the 
3.89:1. With this on the 200 it worked out to 177MPH or so at 6500rpm. 
Unfortunately the first 4 gears on this 016 is even quicker than those on 
the 016 used in the 5k/100/200.

What about a diff ratio change?