I have just built my FK05 and followed the instructions which said the pre-built rear diff could just be installed. It seemed very smooth when tested by hand and so I fitted it. I have since found that it had no oil / grease or lubrication of any kind in it. I seem to have found this before doing irrepairable damage to the diff so have been lucky. On talking to another FK05 owner this seems to be a common problem. Not what you would expect with this quality of kit. Also any reason why UK spec kits do not have a standard front differential, as the first thing I have had to do is order one and am still waiting. :cry:
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