This video tutorial will help you get the gearbox out,

http://www.youtube.com/watch?v=Wr7AJqIF4PA

these guys have a heap of vids on youtube on how to maintain your baja,

i often look through their clips before i tackle things on my baja, as they give some great tips along the way,

anything from the easiest way of fitting hostile axle boots to rebuilding the baja diff.