Rear diff drain plug centre underneath, fill plug on left hand side front of the casing here [
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btw they are both 17mm allen headed plugs, I made a removal tool from a wheel stud with a couple of 17mm nuts threaded on and then welded up.
020 Gearbox & Transfer box oil filler plugs here
The drain plugs are underneath
The later 020 box has a filler/level plug on the left hand end and does not fill through the speedo cable hole,
please note that the 020 box & transfer box have seperate oil and DO NOT have transfer oilways between them.
