To what level do you fill your rear differential to? - Ford Mustang Forum
 
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post #1 of 9 (permalink) Old 11-19-2012 Thread Starter
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To what level do you fill your rear differential to?

What level do you fill your rear differential to?

I am from old school and would normally fill it until the oil is level to the threads on the filler plug.

The manual says to fill 1/4" to 9/16" below the threads on the filler plug.

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post #2 of 9 (permalink) Old 11-19-2012
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Go old school....fill it until it barely starts creeping out of the drain plug threads. Just did my son's differential about a thousand miles ago....no problems doing it the way I described.

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post #3 of 9 (permalink) Old 11-19-2012
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If you have an 8.8 rear end, fill it 3.75 pints (1.8 litres). Then add 4 oz of friction modifier (a small bottle) if a posi.
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post #4 of 9 (permalink) Old 11-19-2012
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What they said!

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post #5 of 9 (permalink) Old 11-20-2012
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Fill it to the threads
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post #6 of 9 (permalink) Old 11-20-2012
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Just squeeze that bottle until it comes out a bit then stop. Easy.
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post #7 of 9 (permalink) Old 11-20-2012
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Worst case if you fill it to the hole and drive it hard, some may come out the vent tube on the axle.
I tend to fill it about 1/4" under the hole.

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post #8 of 9 (permalink) Old 11-21-2012
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Quick question, and I don't mean to thread-jack, but what weight (I'm guessing that's what the numbers on differential fluid mean) goes in the rear-end of a 2005-10 GT? I need to change mine out, but I don't know if it's 75w90, 75w140, or 85w140.

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post #9 of 9 (permalink) Old 11-21-2012
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Quote:
Originally Posted by BruceJack View Post
What level do you fill your rear differential to?

I am from old school and would normally fill it until the oil is level to the threads on the filler plug.

The manual says to fill 1/4" to 9/16" below the threads on the filler plug.
Quote:
Originally Posted by powerproman View Post
Go old school....fill it until it barely starts creeping out of the drain plug threads. Just did my son's differential about a thousand miles ago....no problems doing it the way I described.
Quote:
Originally Posted by 93ksstang View Post
Fill it to the threads
Quote:
Originally Posted by s197inthe208 View Post
Just squeeze that bottle until it comes out a bit then stop. Easy.
Quote:
Originally Posted by TexasBlownV8 View Post
Worst case if you fill it to the hole and drive it hard, some may come out the vent tube on the axle.
I tend to fill it about 1/4" under the hole.
Old school all the way. And Texas is right, if it's too full it will puke a little out the vent. I find that unlikely though. My 07' is filled to the threads and I have had it out on the roadrace course. It didn't puke a drop. And if it doesn't puke at the roadrace track, it won't.

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