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International Automotive Technicians Network
Re: General GM Transfer Case Question
Posted to Transmission Forum on 1/25/2018

It's common for the cases, especially the 261 &263 units, to have the oil pump wear pin holes thru the back case from the inside. This happens in the upper part so it mists out at hiway speeds and doesn't cause a drip in garage so no one knows till it's a mes... Login to read more.