qt50 rear end noise

Johnny S /
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I just acquired a qt50 got it running and had a bad noise in the rear end, I tore it apart and cannot see anything physically wrong with the gears but the bearing on the drive gear (in the attachment below is bad) im not sure if this if going to take care of all the noise though, seems like where the gears mesh is loud, are these gearsets known to wear out/be noisy?

thanks

qt gear.jpg
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