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					Originally Posted by tzincp  This was done within the past year by a reputable independent shop at the time of a clutch change. I wonder why they didnt do the IMS for another $80 ish in parts for an equivalent bearing... | 
	
 
With at least a 90% never-failure rate, a lot of owners don't worry about it. And the most popular replacement bearing from LN is close to $800, not $80. 
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					Originally Posted by tzincp  The invoice states that they changed the "Main Camshaft Seal" at the same time. Is this referring to the RMS? | 
	
 
As Maytag said, I'm sure they meant Main CRANKshaft Seal which is the same as the rear main seal (RMS).