3rd gear locks up rear tire ?

My 01 yz426 locks the rear tire whan put into 3rd. My mechanic has split the cases twice and also got a 2nd opinion when it was open . Both mechanics couldn't find any thing wrong. Please help! Weather is nice again.

If there isn't anything wrong with the third gear pair, like a missing tooth, then it may be getting into two gears at once. This is supposed to be impossible. Look for a bent shift fork or an improperly assembled trans shaft, bearing out of position, etc. Roll through the gears with the trans opened up.

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