You'll probably need some 300k or so in the center diff. If thats not enough, about the only thing thicker is 500k and that might be to much. Also, to keep the front from unloading, you can go thicker in the front as well. That should help a little.
so are you saying to put thicker oil in the front diff? and will this setup eliminate crazy wheelies? im ok with a small wheelie as long as it does not hit the wing and the front goes down after you accelerate