Too many variables here but you need to start by making sure the axle is all the way into the trans. There is a little clip at the end that needs to snap in.
A hands on inspection is needed.
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Alex
Engine is 'drinking' oil .. Transmission needs rebuilding .. Axle shaft popping out of place .. Perhaps it's time to consider purchasing a newer vehicle..
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Is the ring at the end of the CV joint called a snap ring ??