Need help venting new transfer case
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Mountain Pass
Joined: Apr 2003
Posts: 139
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From: Pryor, OK USA
Need help venting new transfer case
I have a 92 f150 4x4. My transfer case ate itself so i purchased a used replacment from a reputable 4x4 shop. They opened it up and checked everything out before selling it to me. The issue i am having is the hole for the vent tube should be fine threaded but someone has tapped the hole for what looks to be a 3/8 coarse threaded bolt. So now i am not sure how to vent this thing. There is however a second fill plug (mark fill for pto only) on the front just to the left (driver side) of the normal vent and shift sensor toward the top of the transfer case. Does anyone know what this is and if I can use this location to vent it or can I just run the transfer case with out the vent. This truck is just my project and won't be leaving this area for higher or lower elevations, so theoretically I should not need the vent. Can someone either support or veto my theory so I don't shell another transfer case. Thanks for any input.
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Mountain Pass
Joined: Apr 2003
Posts: 139
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From: Pryor, OK USA
Thanks for the quick reply. I will see what I can come up with at work Monday and then try that with some rtv to back it up in case of leaks unless someone has a better idea.
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Mountain Pass
Joined: Apr 2003
Posts: 139
Likes: 0
From: Pryor, OK USA
I think I will just get a 1/8" NPT tap for the hole. Now since it is soft aluminum will the shavings hurt the transfer case. If so how to keep them out shy of taking the whole case back off and busting the case in half?
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Thread Starter
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Mountain Pass
Joined: Apr 2003
Posts: 139
Likes: 0
From: Pryor, OK USA
Well so far so good. There is a second fill hole on the front of the case about 1" lower and 3" toward the driver side of the truck that I used for the vent. I will probably have to get a longer hose so I can run it under the shift linkage and away from the front driveshaft. Other than that I will just keep an eye on the fluid level for a while to make sure there are no issues. Thanks for the help.
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