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  #1  
Old 08-10-2011, 10:32 AM
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No breather vent in rear axle??

I own a 2003 Superduty. I was putting my boat in a lake with a real shallow launch so I had to back in until my back tires were completly under water. Afterwards I wanted to make sure the vent tube on my rear axle was long enough but I couldnt find it. Is there not a vent on my rear axle?
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Old 08-10-2011, 10:54 AM
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Rear Axle Breather

I just looked at my 03 F-250, and I have one. It's on the left (driver's) side. Look at the tee where the rear brake hose meets the 2 steel brake lines. It's incorporated into that tee. On mine, the vent hose goes up from that tee to under the bed.


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Old 08-10-2011, 11:04 AM
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Agreed..if there was no vent...your driveway would be soaked in gear lube every time you parked. My 99 dually has the tee as well
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Old 08-10-2011, 11:18 AM
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I found it. It was covered with grim and dirt so I didnt see it before. Unfortunatly the is no hose. So should I be worried? It wasnt underwater for more than a few minutes. I drove it 200 miles home afterwards. No noises or anything.
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Old 08-10-2011, 11:20 AM
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I would drain n refill, water may not play well in there
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Old 08-10-2011, 11:26 AM
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Time for a rear fluid change. Not even considering that the vent was underwater this time, how long has it been going without a vent tube, which could allow dirt, water spray from a wet road, whatever into the differential.

And you'll want to get a vent tube on there. If you look around, the original tube might be hanging around loose under there. It would have gone up to a open V shaped fitting connected up under the bed somewhere.
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Old 08-10-2011, 11:28 AM
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A hot diff soaked in cold water will pull a vacuum and potentially suck water in the disconnected diff. vent. You need to check/change it immediately, and possibly change it twice. Getting the diff good and hot with the new lube should drive off any remaining water, so I'd recommend a road trip after you change the oil.
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Old 08-10-2011, 11:38 AM
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Ok I'll change it. I cant find the disconnected hose anywhere so I gonna have to buy a new one. Who knows how long its been gone. Ive only owned the truck 5 monthes. Any idea what oil I need to put back in it??
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Old 08-10-2011, 11:43 AM
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Assuming it's a single rear wheel F-350.

75W-140 Synthetic Gear Oil and a friction modifier for the limited slip clutch pack.

Some companies (like Mobil 1) will make the oil with the friction modifier already in it. It should take about 3 1/2 quarts.

You'll also need some black silicone gasket maker, to seal the cover back up.
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Old 08-10-2011, 11:43 AM
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http://www.guzzle7pt3.com/rdiff.php.
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Old 08-10-2011, 08:15 PM
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REAR AXLE

While you have the cover off, I would lift each side of the axle with a hydraulic jack under each shock mount 1 at a time for a few minutes. This is just in case water got into the axle tubes. If the rear end was under water for a few minutes, you might have quite a bit of water in there.


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Old 12-21-2011, 04:28 PM
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I know this is old, but can't find much info on this topic.

My breather tube has fallen off the tee. I have the tube, however I can't figure out where to connect the Y fitting on the other end?

Somebody said it connects up under the body. Does anyone have a photo or know where this connects?

2002 F-250 5.4L

Thanks
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Old 12-22-2011, 02:07 AM
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Excuse my ignorance. Entry level question here!

Why does the rear diff have a vent tube? Does the front? I was unaware of this until today.
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Old 12-23-2011, 07:13 PM
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Know for sure the rear has a vent and almost sure the front does to but not 100% sure - vent is to allow gasses to escape as the oil in the pumpkin heats up - if they weren't vented the pinion seal would get blown out. (Ask me how I know - plugged vent on a 99 F150 + 150 miles @ 65mph = blown pinion seal and a diff soaked in gear oil)
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Old 12-23-2011, 08:05 PM
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Could this cause a blown inner axle seal? My front left inner axle seal leaks.
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Old 12-23-2011, 08:05 PM
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