I have just done my front and rear diffs on my B44 for the first time.
My B44 was second hand as well - looked up 'how to' online, this is a useful vid:
http://www.petitrc.com/setup/associa...ips/index.html
Try the 2nd and 3rd video.
In the end quite easy - I need to upgrade by diff balls as well to some nice shiny ceramic ones
