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Old 10-06-2011, 02:36 AM   #1 (permalink)
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8.8 axle vent (5/16") confused...

All,

My 8.8 rear axle has a 5/16" fine thread for the axle vent, does that indicate that the rearend came from a certain year Mustang or possibly a truck? I can't seem to find a Ford part for that size, everything I find is 1/8".

The rearend came with an orange plug so I'm assuming it wasn't drilled and re-tapped. Any idea if I can just run a 5/16" fitting with a hose for a vent?

Thanks,
Lou
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Old 10-06-2011, 02:45 AM   #2 (permalink)
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Your right it 1/8"pipe.That what it should be.Just use a vent from any 8.8 axle.
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Old 10-06-2011, 02:59 AM   #3 (permalink)
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Thread terminology

Pipe is always measured by inside diameter and tube is measured by outside diameter.

1/8th inch pipe threads are 1/8th inch inside and about 5/16ths outside due to the thickness of the pipe walls. For instance a 1/2 inch pipe thread tap is about 3/4 inch in diameter due to the approximately 1/8 inch thick pipe walls.

On my 8.8 rear end I found that the 3rd link banana bracket covered the vent hole so I welded it up and drilled a hole toward the top of the back cover and put a right angle -6 AN bulkhead fitting and a 2 foot piece of hose in as a vent. I anchored the end of the hose to the frame with a loop between the diff housing and the frame to allow the rear end to move up and down. I put a 3/8 plastic fuel filter on the end to allow the vent to breath but not suck in any debris. If the 3rd link bracket doesn't hit the vent you don't need to go to those lengths.

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Old 10-06-2011, 04:00 AM   #4 (permalink)
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Guys,

Thanks. I guess it is NPT, not fine thread. I found this after searching around:

Ford Rear End Breather

I think I'll look for a fitting and just run a hose as Roadracer83 suggested.
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Old 10-06-2011, 05:01 AM   #5 (permalink)
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Cool little vent

Jeg's has got a neat little vent with a filter in it. A 1/8 pipe fitting with a nipple on it would work also. Just use some 1/4 or 5/16 hose. NAPA has those hose fittings.

JEGS Rear Axle Vent - JEGS

This is what you are looking for but you can get them in brass for a lot less.

Holley Performance Hose Barb to Pipe Thread Adapters Products

ron
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Old 10-06-2011, 05:45 AM   #6 (permalink)
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Ford part number should be 4R3Z-4022-AA.
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Old 10-06-2011, 02:46 PM   #7 (permalink)
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XXXXX - recommended part did not fit

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Old 10-06-2011, 08:40 PM   #8 (permalink)
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8.8 vent

The vent on the mustang 8.8 rear end from 1987-2004 is a special thread and come from Ford only
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Old 10-07-2011, 03:16 AM   #9 (permalink)
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Old 10-07-2011, 03:08 PM   #10 (permalink)
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Thanks guys. I'm going to stop by Ace Hardware today and try the 1/8 NPT fitting. I have a leftover filter from a bike project that will work on the end of a hose to keep the dirt out.

Lou
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