GM 00-07 transfer case issue
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GM 00-07 transfer case issue

  1. #1
    The Good mrjoshua's Avatar
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    Default GM 00-07 transfer case issue

    I just read that there is a common problem of the pump housing in the transfer case rubbing a pinhole in the transfer case itself. Is this as big of a problem as they made it out to be in the article? Any idea of labor costs to do the preventative fix?

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    Senior Member EVILFORCE's Avatar
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    What truck is this. Never seen what you are talking about.
    No Fool Like A Old Fool is there?

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    The Good mrjoshua's Avatar
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    Quote Originally Posted by EVILFORCE View Post
    What truck is this. Never seen what you are talking about.
    I have a 06 duramax. The article itself was about GM transfer cases from 97-07 on all 4WD's. they said the internal bracket that holds the gear fluid pump in the housing is aluminum but the housing is magnesium. In the corners where the housing tabs sit in the magnesium transfer case it said vibration will lead to the housing being eaten away by the bracket from the inside and cause pin hole leaks in the outer housing.

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    Senior Member alek72us's Avatar
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    Its true i have had to fix mine. i fixed mine myself. if you google "pump rub" more will come up and there will be some fixes also. if yours hasn't happened just watch the transfer case fluid. if you dont want it to happen get it fixed the t-case will have to be dropped and split. like i said google it alot will come up. its for every gm 4x4 along those dates.

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    Senior Member JakeC.'s Avatar
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    I have seen and fix quite a few of those over the years. Including my own truck. The little bracket brakes and rubs a pin whole in the case half. At that point replace the case half.

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    Senior Member alek72us's Avatar
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    I jb welded mine. but that was jut because i would have waited two weeks for a back half and i was in a hurry. it has been holding up. but yes get the back half if you can.

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    Senior Member rogerroost's Avatar
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    if it hasn't leaked yet you can get a case saver ,basicaly a steel shield that fits over the pump. if your mechanically inclind you can do this job, it's pretty easy

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    Senior Member toon's Avatar
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    Get either kit they both work. If you already have a hole in the case just jb weld or epoxy over it you don't have to get a new rear half of the case. I have done the fix on 5 duramaxes and 3 silverado/suburbans. 6 already had holes in the case. Both sites and the Diesel Place have articles on how to do the fix.

    pump_rub_fix_transfer-case-pump-upgrade-kit

    Kennedy Diesel
    Last edited by toon; 12-04-2012 at 02:23 PM.

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    The Good mrjoshua's Avatar
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    Is this something that could or will happen? How common? I have not crawled under mine yet to inspect it, I have 130k on the truck if there is not a problem by now are the chances good there won't be an issue?

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    Senior Member rogerroost's Avatar
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    VERY common. If you like the truck why not FIX the issue before the hole happens, then don't worry about it.The plate is cheap.The hole and leaking on the driveway is not the real problem. The t case only holds 2 or 3 liters of oil,so when it leaks out, & you don't realize it , keep driving with no oil,thats when the real problem happens

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    The Good mrjoshua's Avatar
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    Does this look like a leak. This is on top of the transfer case. Does not look like much. Could I use the fix kit and just JB weld the hole since its on top?Click image for larger version. 

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  14. #12
    Senior Member toon's Avatar
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    Clean that area real good and see if you can see a hole. It not, go for a short drive after you have cleaned the case (couple of miles at some decent speed) look up in there again and see if any fluid is coming out. Where you have all that gunk is one of the pockets the pump ears sit in inside of the case and the holes are always formed in those pockets. I have tried to just epoxy the outside of the case before and it is just a temp fix. The pump will continue to wear the inside of the case and cause another leak some where down the road. If you are going to be keeping the truck for awhile I would just install a pump rub kit for piece of mind.

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    Senior Member rogerroost's Avatar
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    Thats not the spot

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    The Good mrjoshua's Avatar
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    I will pull it and install the kit. Just wondering if there is a hole but its where the top ear is ( as in the pic) could I get away will using JB weld instead of replacing the outer housing? I figure the hole would by dry with the truck off. It wouldn't 't always be exposed to fluid correct?

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