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Old 09-02-2013, 10:48 PM
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Texasdoc Texasdoc is offline
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Join Date: Feb 2012
Location: Keller, TX
Cobra Make, Engine: Lonestar Classics LS427. Self-built 408W, AFR 195 heads, Performer RPM Intake, Quick Fuel 750, 407rwhp, 479rwtq
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Default Ford 9" oil leak

I'm getting tired of these slow leaks....

I bought a new 9 inch rear for the cobra during the build from a local vendor. However, shortly after purchase the seller went out of business and moved. I'm not exactly sure which LSD I have inside, but there is one in there.

I have looked all around this thing and don't find a fill level hole. He was supposed to put one in. There is a vent on the top of the housing that I used for filling, but I can't tell how much fluid to put in there. After searching the forums, it seemed like 2 quarts plus the modifier was the average consesus - so that's what I put in.

Now, I keep getting some fluid leaking out of the vent. I'm sure it is not coming from the drain plug. I'm considering changing the vent to a threaded barb, connecting a rubber hose, and raising the vent higher, but I still don't know if the right amount of oil is inside. I don't want to overheat due to too little oil.

Since I have a 9 inch and can't just take off the diff cover, how do I tell if there is the "right amount" of oil inside? What is the right amount of oil? Should the oil come up to the bottom of the axle tubes? (I can take out one axle, make sure the rear end is level, and pour 4 quarts in - whatever comes out is too much.) Without knowing the exact parts, I can't call the local transmission shop and ask them.

Any thoughts on oil level in a 9 inch?
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