I checked the GM shop manual and it's nowhere to be found in there either. As a guide though, since the case halves are held together with bolts that are torqued to 11 - 16 ftlbs, you could safely torque the drain plug to the same amount without worrying about stripping the threaded hole.
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08:34 AM
PK Member
Posts: 1249 From: Oxford, England Registered: Sep 2001
AllData is a virtual service manual for all 1982+ cars manufactured and sold in the US. A lot of dealers use it in their service shops. It requires a subscription and can be used "on-line"
-dave
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11:51 AM
PK Member
Posts: 1249 From: Oxford, England Registered: Sep 2001