Here is a link to a how to that Tamiya Cowboy did on making drive shafts.
http://www.rctruckandconstruction.co...read.php?t=708
I also made mine like this. I am not home right now or I would give you part numbers for the parts needed, perhaps if you send TC a PM he will get ya the part numbers.
Here is a pic of mine... The carrier bearing is made by Meir or Mier.. I got them on ebay but just looked and can not find any, don't know if anyone can help.
If you want to keep the truck some what realistic then you drive lines can not be more than 4.5 inches long.
Here is my inter-axle. Again I have the part numbers at home for these but TC can get them for ya faster.