[DaveW]

Hi Dave,
I' just whipped up a little excel calc if you want it.
Put in your tyre size, gear ratios, diff ratios, and a speed and it will tell you what revs.
Probably others on the net.

For me, 3.7 Diff, TR6060 box with 0.84 5th and 0.57 6th with 295/35R17's will give me 2582rpm in 5th at 100kph and 1752rpm in 6th.....give or take.

Let me know if you want to play with some figures,

Dave