Thanks for your help guys. I do have a full build thread of my truck on my web site
http://www.outlaws4x4.com called
"New Outlaws4x4 off-road class 8 race truck"
http://outlaws4x4.com/?page_id=266/show-us-your-rig/
If you do check it out you will probably laugh at how different my build is now as to when i started. I have been building this truck now for about 2 years in my workshop in my spare time. Originally i was into what we call in Australia "winch challenge racing" which is like off-road racing with sections of the track which are impossible to drive and you must winch up and over and then keep on racing. I like the speed aspect of winch challenge racing which made me want to get into plain off-road racing. We don't desert race per-say here in Australia we more race off-road through different country.
Well our off-road racing classes are similar to yours but not the same.
Our biggest flaw is even our unlimited classes have engine restrictions to either 6000cc capacity naturally aspirated or 3500cc forced induction. This i believe is our major down fall as it restricts so many international competitors coming and competing in our off-road competition. The two biggest off-road races we have here in Australia is the "Finke desert race" and the "Gasgoyne Dash"
These are our offroad classes.
Pro Buggy - Buggy with engines 3500cc to 6000cc and all Turbo engined buggies
Pro Lite Buggy - Buggies with engines 1651cc to 3500cc
Super 1650 - Buggies with engines up to 1650cc and two seats
Sportsman - Buggies with engines up to 1330cc and two seats
Extreme 2WD - Highly modified 2WD Vehicles with engines up to 6000cc (This is our unlimited truck class where Trophy trucks fit in)
Performance 2WD - 2WD vehicles with engines up to 6000cc (Production class)
Clubman - Restricted Buggies
Production 4WD - Production 4WD vehicles with engines up to 6000cc
Extreme 4WD - Highly modified 4WD vehicles with engines up to 6000cc (This is our other unlimited truck class but 4x4 This is the class i am in, it is also known as class 8)
Well in answer to a couple of your questions, At this stage i will be running 4wd full time. It will all just depend on how it handles and if the front axles can handle it. currently they will only be cut and sleeved so strength will be an issue i think. I am looking at running 35 or 37" tyres however i currently have set the truck up on 33"s
I have extended the beams by about 6" on both side so 12" total and have used a mounting similar to standard the front end will have 18" of 4wd travel. the front end is 90" wide
here is a couple more pics of the front end.

Full bump steering set up with steering box and idle arm.
And here is a shot at ride height. i dont like the amount the steering linkage had to be bent so i will be making another one with slightly less of a bend the absolute minimum to clear at full bump and i was also thinking of making that one arms out of something stronger and thicker.
