if it is slipping, then the two obvious things to look at are the diff and slipper, easiest thing to do is pull the gear cover off, hold the two wheels still and try to rotate the spur with your thumb, if it moves and the layshaft stays still, tighten the slipper, if the layshaft turns then it is the diff.
Depending how long you been running it, it mught just be as easy to pull the box apart and rebuild (yes, I know the slipper is a little minx to do....)
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