rcracer I will gladly take a look at the diff next time were racing - where will you be racing?
I didn't have a problem with loose diff at the Euros exactly - but I simply couldn't stop it slipping. it was impossible. since then Its been ok when I rebuilt it with new parts on the big pulley
Something that Hupo does is to reduce the width of the diff pulley inside - where the balls fit there is a lip. Hupo sands this so the entire inside surface of the pulley is flat - he said this helps him to have a non-slip diff.. No idea how it works but it's a pain to do on the old pulleys - on the new big pulleys you can do it in a few mins with a scalpel though as they are just 'dots' that you can cut off.
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