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Posts Tagged: transfer case plug

Remove stuck transfer case drain plug

How to remove a stuck transfer case drain plug GM has issued a TSB #99-04-21-001 to discuss methods to remove stuck transfer case drain plug. The TSB applies to 1998-99 Chevrolet and GMC K1-1 Suburban, Utility Models, 1998-99 Oldsmobile Bravada with NOV136 or 246 transfer case. The drain plugs in these transfer cases are made from aluminum and have a ¼” square drive recess. The user inserts the male end of a standard ¼” square drive extension into the plug to remove it. If too much torque is applied during … Read More

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