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There is no good news in this area... The layshaft needle bearings are a Toyota product it seems, I have never been able to find any for sale anywhere. This means you cannot rebuild a K series gearbox if they are noisy. The needles mark the layshaft, which they run on directly, grinding away the hard steel surface so it is a massive job to get the shaft built up again then machined circular again. I don't know how to check a gearbox outside the vehicle without pulling it apart. If you could turn 20 or 30 K series boxes by hand at different wreckers you might learn the difference in the feel, or it may be something you just can't feel by turning the shaft with no load on it. Just buy one, try it, take it back if its noisy.. They must all have over 250,000km on by now, so they will all be worn. It is the one component that will take our K series off the road in the future.