Glad you enjoyed the day, I thought your 501 sounded a bit off towards the end of the qualifiers and we had a brief chat as everyone was packing up, had the diff balls squared off too or was it just the thrust races that had given up?
On my Durga I've found the thrust races were the only part of my original diffs that were salvageable - just make sure they are adequately lubed with your choice of grease (I'm just using kit ball diff grease) and don't overtighten that stupid screw. I built mine with enough pressure just not to slip, then tighten them after a run as it'll have bedding in a little.
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