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2013 5.0 with 3.73's rear end question.

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Old 03-24-2013, 11:27 PM   #1
Join Date: Mar 2013
Vehicle: 2013 mustang gt
Location: South Carolina
Posts: 1
Default 2013 5.0 with 3.73's rear end question.

I was under my 2013 gt puttin exhaust on and I noticed fluid on the outside of the left side of my axle. Then as I looked closer I noticed a poppet or breather of some kind on the top of the left side of the axle. Does anyone know if this thing is close able or if its supposed to be leaking diff fluid? Any help, advice or info would be appreciated. Thanks
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Mlucas12 is offline   Reply With Quote
Old 03-25-2013, 08:40 AM   #2
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Join Date: Aug 2012
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Location: Texas
Posts: 219

there is a breather whole that is necessary. if it looks to be a machined outlet, DO NOT PLUG IT.
2013 5.0
Lethal Performance O/R xpipe and duel pump fuel return style system, frpp 47lbs injectors, Vortech with 3.48 pulley, Boss heads/Cams, Aluminum Driveshaft, frpp 3.31 gears. pypes pypebomb cat back, mgw shifter. jlt intake, boss 302 intake manifold. bbk 85mm tb.
11.4@130 1/4 at a 3700 DA. (2.0 60ft)
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Old 03-25-2013, 08:09 PM   #3
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Vehicle: 2011 Ford Mustang, 1965 Ford Mustang
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There was a TSB on the 05-09 axle assemblies concerning the breather tube, nothing yet for the 11-13 models, so I imagine they fixed it. Mine leaked when I first got it and I haven't noticed any new signs of dripping. If you want it "fixed" for peace of mind you can buy this bulb thing. Another alternative is to make your own vent tube that is longer so the fluid can't get out due to gravity and the gas can still escape. There are numerous ways to do this, if you're unsure just google rear axle vent images and you'll find something. Click the image to open in full size.
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2011 GT: 428/418 hp/tq
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Old 03-25-2013, 08:09 PM
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breather, differentials, maintenance, mustang, valve

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