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Tahoe & Suburban The power, space, and brutal towing ability make the Tahoe and its longer sibling, the Suburban, arguably the best full size SUV's on the market today.

2013 Chevrolet Suburban
Platform: GMT 400, 800, 900

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Old 10-28-2010, 09:41 AM
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Join Date: Oct 2010
Posts: 1
Question Transfer Case Pin Hole Leak Question

I have a 2003 Z71 Suburban with 150K miles on it....recently I noticed a pin hole leak (slow drip when hot) in my transfer case leaking the blue fluid....not sure if it's porosity or a crack but doesn't appear to be a crack that I can see. It's in a good spot to repair (from below) IF that can be done while still on the vehicle...I'm sure it would be very costly to R&R soooooooooo I'm looking for advice of IF and HOW would be the best way to deal with it. It appears to be a cast alluminum housing. I'm thinking...Drain/lower fluid...clean and either Epoxy, weld, tap and install screw etc...anyone have any experiance with this type of situation/repair? and thanks in advance.
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Old 10-28-2010, 10:25 AM
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Join Date: Feb 2008
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Default blue?

I was under the impression transfer cases used automatic tranny fluid... which is generally red...

is that inaccurate?

nope: GM has a new Auto Trak II Transfer Case Fluid (GM Part No. 12378508), which has a bluish color to it

could be blue! go gm... way to mess w/the color scheme...
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Old 10-28-2010, 06:49 PM
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Location: KC, MO area
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Clean it very well w/ brake cleaner and seal it w/ 5 min JB Weld. If the leak is slow enuf, you shouldn't have to drain it.

Next way was as you suggested to drill, tap, and install a screw using a sealer.

Let us know how it works out.
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Old 10-28-2010, 08:15 PM
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Location: Bowie, MD
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Use JB weld
ASE Master Tech, L1 Advance Engine Performance certified
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Old 10-28-2010, 08:15 PM

2004, appearance, case, chevy, equinox, fluid, gm, hole, holes, leak, leaking, pinhole, repair, tahoe, transfer

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