[suicideneil]

On the center diff issue, Mike can and has built them for a very lucky few (custom order). The only issues I am aware of are:

1) requires drilling new holes into the lower chassis plate to mount the unit, so you will have to send in all or part of your truck.
2) Limited to about a 44tooth spur spear on the center diff, meaning you will need some small pinions to get the correct gear ratio, but the calculator should help with that.

No idea about price ro timescale, you will have to email Mike about that. It is a nice upgrade though for a racer, if you can get it tuned just right, but for a general basher or speed machine, I dont see it as being so useful. The centrally mounted motor is the biggest draw for me, but I think Im starting to like the whole offset motor thing now...