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The first one is an early style which is a non-vented opti and does not use a spline drive. The one from Hamilton is the newest version and it is vented and does use the spline drive coupling. ALL B-body's from 1994-1996 and F-body's from 1995-1997 used the spline drive vented opti's. Nobody has cracked one of the new ones open yet to confirm if it uses the good sensor or not that I have spoken with.


Mike--Hamilton Chevy
 

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Discussion Starter #3
Mike,

Thanks. I'm not too hip on the opti. I just read here how it's a PITA finding good replacements. Just trying to pass on what's available. Hard to teach an old dog new tricks.

Mark: Snowman-33
 
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