IIRC ... if we were to "dig" into the archives here and the early stages of the pinion seal leaks - the early leaks were blamed on a malfunctioning seal.
Perhaps this recall is just an assurance that ALL vehicles - those who don't frequent forums, those not driven often, those that have not leaked YET, etc. - will indeed be retro fitted with the NEWER pinion seal and thus reduce the odds of further issues in safety as in the two stated in the GM document.
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#139640 '07 NA Sly Fully Loaded 12/1/07
#106614 12/15/05 NA Sly Traded @ 35k Miles
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