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If you overfilled it (170 cc!) excessive oil should have come out (mist/drops) from the final drive vent (on top).

There is a large oil seal and an O-ring in there that may be bad. #25 and 29 on picture. It seems that these are hard to get now. Also - it´s not unique that the bearing cage on the large bearing (# 21) starts to break up. It´ll take out the oil seal (# 25). The bearing itself is NLA (and was rather expensive - > $ 100).

You CAN replace everything inside there, but there is some shimming (# 11) that should be done if you´ve replaced the main components. If you only replaced oil seals and O-rings you should be able to do without re-shimming. Take reliable notes on how things were sitting.

Easiest way would probably be to get a used final drive from a boneyard/wrecker. I have a bunch in a corner of my garage. Good to have...

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