good question!
I have a few preds (not the x11 yet as per thread) but I have always had this issue... in fact im turning the prop shaft on a brand spanking x10 that i have never run (and prob never will) and its doin it.
on previous cars it has gone after one run so it may just be a slight high section on the bevel gears (im talking a thou or even less) or slightly off line bearing carrier, again hugely minute measurements, but thats what ive put it down to..
Maybe niggs or kev or the other fellas have some more idea (as im sure they do haha)
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