6.5 chev. diff ratio's?

[frosty1]

hi everyone, big decision to make and would greatly appreciate any opinions. I have a gu patrol with 6.8 diesel chev, my current diff ratio is 4.3. I don't often use first gear on flat ground takingoff but in fifth gear at 100km /h it's really revving. I also have standard size tyres . could get bigger but more common size tyres prob. easier to get in remote areas. Thanks.

[ourtrek]

G'day Frosty, On my research I would recommend a 3.7 Final ratio, this would sit you at around 1500 RPM at 100 kph. I used 3.55 as that was all I could get at the time and I run at 1200 RPM at 100, trouble is she now keeps wanting to run at 120kph.
ourtrek