Bobby long's real life axle strength testing. (he is a axle parts vendor) This is a post that everyone should read! I'm sure that he will be updating the list to address requests. He has tested some products that the vendors have asked him not to make the results public.
http://www.pirate4x4.com/forum/showthread.php?t=467075
http://www.pirate4x4.com/forum/showthread.php?t=467075