Thanks guys, if I can reduce my revs by 500 to 1000 rpm then ill be happy till the 5speed comes along. To me driving on the freeway at 5000rpm is not cruising. And for long periods of time forget it. ill do a few calcs and see what I get. Cheers, also the tyre profile is a good one, I have 50 series profile now I might try 60 next.

From what I've read. Ill need the shim to use the bluebird diff, but my axles and tailshaft should be fine from the 1980 1200 ute.
Is that correct?