Birfield joints (birfs) are the CV joints in the front axle. There is an inspection port in the top of the knuckle housing through which moly grease can be added to keep them lubed. If the clicking is only present when the front axle is engaged at the hubs, and is only noticeable in turns, then dry and/or worn birfs are the likely culprit.hello i am an fj60 newb
i also have 33s on stock rims and the clicking noise. what are these birfields you men speak of?
Towards the front of the knuckle housing on the top you'll find a threaded plug with a square head. If you clean up the area around it, and open it up, you can pump grease in with a grease gun and needle, or a syringe of some type.where is the inspection window to check on the inner hub?