almost any small diesel will do.
assuming you want more power and more speed...
DONT.
the gearbox wont handle it and after you upgrade that the diffs wont last.
you should have 4.7:1 ratios in the diffs swapping them to 4.1:1 seems to work well with the holden conversion for onroad use (even if you tow a little) and doesnt kill you for light offroad work.
If you're only using it for "cruising" you can goto the 3.54:1 diffs but you loose the lowdown crawlability of the vehicle.
if its a stage one thats a different story but they came out with a 3.5l v8 or a suzi diesel.


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