Something else to think about...at least in the 4th gen 4runners, there are 1 to 2 breather tubes in the engine bay, on the driver's side of the engine block. If you have a V6, then you should have 2 breather tubes (with silver caps). If you have a V8, then you should have only one. The transmission and transfer case do NOT have breather extension. They have breather caps just like the rear axle. So, Toyota only extended the front differential...the other stuff is for your weekend projects!
Here is some good info on the FJ forums:
http://www.fjcruiserforums.com/forum...ather-mod.html
I would highly recommend the above mod(s) if you go off-roading a lot or do mudding/river crossings.