Overdrive

["eugene faust" <ejfaust@worldnet.att.net>]

There seems to be significantly less vibration and noise when driving in
overdrive with my 100M.  However, switching in or out of overdrive gives
the drive train quite a jolt unless I use the clutch which the owners
manual says I am not supposed to do.  Lately, I have been leaving it in
overdrive all the time which seems to work well. 
 
Is there any reason why I should not do that?
 
Gene

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