zbuild,
I have been looking at this for a while now also. Haven't done much yet due to being incredibly busy with other commitments.
However here is what I have done or am going to do or have looked at:
Rear suspension - ARB OME HD shocks, ARB OME greasable shackles, 1988 Jackaroo 5 leaf packs.
Front suspension - Ball joint flip, wound standard torsion bars, ARB OME shocks.
You can also fit a spacer with the ball joint flip. Although I don't think I will anymore as it would look more stock to a copper etc without the spacer.
If you want the rear leaf packs reset with an extra leaf 'Fulcrum' was going to do mine for $240/pair if I removed them.
The Jackaroo springs are $100/pair from the wreckers. Although the 5 or 6 leaf packs appear to be rare. They only seem to be on 1986-89 Jacks.
I've been told by this forum that the 6 leaf packs will give 2.5in of lift and from my observation the 5 leaf should give 2in.
I have only just thought about this but MU/Frontera/Jackaroo had coil rear suspension on later models. I am not too sure of the Jack but it would be possible in theory to get a rear chassis cut of a MU/Frontera and transfer the coil suspension as all is the same otherwise (it would appear that way anyway). I don't know if this would work in practice but I am going to look into it but most likely I won't actually do it.
As for front torsion bars, I am happy with my standard ones. I also have about 80kg of extra weight over the front with bullbar/winch/batteries etc. I would advise you just crank your standard ones and see how they go before you shell out the $500 + fitting for aftermarket ones. Apparently I can fit V6 torsion bars from the wreckers if I want stiffer ones (I have the 4cyl) but I guess you have the V6 engine.
Here is a website for the ball joint flip.
http://www.expeditionswest.com/equipmen ... nsion.html
If you look around the Isuzu section here you will find most of this info from when I asked about it.
Have fun.
