Take the diff apart and give it a re-build.
When you put it back together make sure when you put the thrust bearing in, make sure it is well lubed up with something like Associated Black grease and that the screw head goes on the side with the indent in the copper coloured bit (you'll see what I mean). When you've built it, tighten it until it doesn't slip. Then run the car at 1/4 ish throttle holding one of the wheels for 20 sec or so, swap over and then hold the other wheel. Adjust the diff as required and keep doing this until it doesn't slacken off any more.
This advice was given to me by DCM on here and it works. I haven't had any trouble from mine since building them this way.
Ian
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