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I haven't looked at the internal diagrams of the transmission but as with most transmissions most of the first couple or 3 synchros are usually double synchros and/or stronger material. The overdrive are usually made of softer material to reduce noise during engagement. Like someone up a few replies said its not about speed of the vehicle it is more related to input and output transmission speeds. That could be related to why 6th gear may have worn out quicker. 6th gear is an overdrive and cannot withstand constant fast engagement. Learning to properly rev match can lengthen transmission life. Some driving school focus a lot on proper shift engagement. Wish ya the best and if in fact the transmission is just bad, I hope the dealership works with you.
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