Ford 9" fluid question

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Sep 14, 2017 | 11:25 PM

filthy6

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From: Bakersfield, CA

Ford 9" fluid question

I filled my rear differential today. Took a quart and a half before it started coming out the fill/drain hole. The hole is located at the rear of the diff. I know it was bone dry because the guy who rebuilt it told me to fill it. That same guy and the local Ford community are all in agreement that it should take five pints. Anyone have a guess why I'm two pints shy?

Sep 15, 2017 | 12:45 AM

seaves46

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From: australia

You should have a fill plug on the side of the pumpkin , is it higher than the one on the rear of the housing ?

Sep 15, 2017 | 11:46 AM

filthy6

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From: Bakersfield, CA

No fill plug on the side. In better light I found one in the front " honeycomb" part of the diff, BUT, it measures at the same height as the one at the rear. ????????

Sep 15, 2017 | 11:49 AM

ALBUQ F-1

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From: NM

Are you sure the rebuilder didn’t put "some" oil in, to prevent rust, etc.?

Sep 15, 2017 | 12:06 PM

filthy6

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From: Bakersfield, CA

That was my thought. Difficult to know for sure. Don't know if the work was done in the morning or the afternoon.......if you know what I mean......He said he gave it to me bone dry. He even put a piece of tape on it reminding me to fill it. I'm going to try to find a different way to approach the subject. I have respect for his knowledge and skill. He has helped me a lot.

Sep 16, 2017 | 04:52 AM

fordslut

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From: rosemead ca.

is it for a dragster and very narrow?

Sep 17, 2017 | 03:01 PM

filthy6

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From: Bakersfield, CA

Quote:

Originally Posted by fordslut

is it for a dragster and very narrow?

NO, but it does bring up a question. On initial fill and before start up is the 5 pints confined to the center housing or should some migrate into the axle tubes?

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Sep 17, 2017 | 03:20 PM

ALBUQ F-1

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From: NM

A lot of oil clings to all the gears, too. I'd drive it a mile or two, let it settle, and top up. As said, going around corners will get it out in the tubes.

Sep 17, 2017 | 05:46 PM

#10

Ct70

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Joined: Sep 2016

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From: Sudbury ontario

You might try jacking the rear up one side at a time for 15-20 minutes to make sure you have oil to the bearings ,then re checking the level .

Sep 17, 2017 | 05:51 PM

#11

Flat Ernie

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From: FL

I generally fill through the vent...often much easier and I put in how much I want.

Sep 17, 2017 | 06:16 PM

#12

fordslut

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From: rosemead ca.

I just filled a newly rebuilt 8 inch rear through the brake line vent brass "Y" in the top of one of the tubes. another way to fill/empty is to jack up on one side, and pull an axle out. a bit "shade tree", but it works. just don't mess up the seal.