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The root and the top of each spline should be more square cut, less sharp. They don't look stripped in your shots, that means the tooth is worn off completely. They do look very worn. A little hard to tell without comparing the length of the splines.
Replace both, IMO.
Check the chain before you take the case apart, to see how loose it is and whether it needs replacing at the same time.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
Last edited by JCL; 11-21-2012 at 01:14 AM.
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