I had a service done a few years back and the mechanic found very small parts of contamination on the magnetic drain plug and blamed it on the weakness in the fifth gear splines and recomended they pull out the gearbox to check it out only to find it was it was a bearing race that was slightley scored and recomeded replacing the bearing and race and apprently they were supposed to come in a set blah blah so almost $5000 later they said "better be safe than sorry" oh and bye the way you have the upgraded spline in the gearbox so that it not a problem .....yeah right.