What diff ratio do I have?

[saladine1]

I've got a VL V8 diff with 3.08 gears(supposedly) in my VK 308 trimatic sitting on 15*7 Brock wheels.
The car sits on 2000 rpm's doing 80 kmph.
Does this sound right for 3.08 gears?

The car previously had 3.45 gears with 17's. I don't know if speedo was calibrated for the 3.45's or what, but the speedo was not done when I changed the diff and wheels.
Can anyone help?

[ari666]

whats it sit on at 100? much more reasonable figure to deal with.

my 3.55 is on 100kmph when its revving at 2800

[saladine1]

Sorry for the late reply.
At 100km/h, it's sitting on 2500 rpm's.
I just don't want to change to 3.45 if it's already there!