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Originally Posted by bigbleu515
The manual calls for fluid GM #12378396
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236 or 246 transfer case?
The part no may have been changed but it is known as the GM Blue auto-trac transfer case fluid.
Needs service and flushed ever so often.
Serveral TSB's out there on it.
Drain and fill up and drive and then drain and refill.
It is a Dealer idem/part.
Good Luck
MT