How much gear oil did your diff take?

gripdriver · Sep 3, 2017

My 2014 GT track pack diff took all 3 quarts of gear oil and was still about 1/8" to 1/4" below the fill hole on the diff cover.

From what ive read it should take 2.75 quarts.

Do i have any reason to be worried about this?

BigTaco · Sep 3, 2017

If it gets real hot you may puke oil out of the breather vent. That normally only happens during hard driving track events. You have a overflow/breather can in place?

Grant 302 · Sep 3, 2017

You should be okay. That's only a bit overfilled since specified for 1/4" to 9/16" below. IIRC, last fill was less than 3 qt. to get it to -9/16"

gripdriver · Sep 3, 2017

I live in AZ, so its always hot. I have a track day sept 9th (next sat).

I do not have an aftermarket diff breather/expansion tank in the car yet, but it is on my list of things to do....maybe ill move it up the list.

Grant 302 · Sep 3, 2017

My GT hasn't puked since the factory overfill and moving the vent from the left tube to the top of the finned diff cover when I changed from the stock stamped steel.

Boss never puked with the vent in the stock location at the top of the OEM finned diff cover.

gripdriver · Sep 3, 2017

Grant 302 said:
My GT hasn't puked since the factory overfill and moving the vent from the left tube to the top of the finned diff cover when I changed from the stock stamped steel.

Boss never puked with the vent in the stock location at the top of the OEM finned diff cover.

I should have looked at my vent situation while i was under the car. I have no idea which factory configuration i have.

wwilde001 · Sep 3, 2017

So I am not quite sure what to think. The owners manual has the capacity at 2.4L which is 2.5 quarts (per the supplement). Am I missing something in how much gear oil our axles takes? Also, you should not be using the diff cover fill hole to determine the level of fluid in the diff. You should be using the fill hole that is on the left front side of the diff. You will have to crawl under the diff. to see and access this one.

BigTaco · Sep 3, 2017

2.5 quarts is the factory recommended fill, you are correct. If you really want to scratch your head, the 2013 GT500 only take 2 quarts without the factory cooler....

wwilde001 · Sep 3, 2017

So I am thinking as long as you have between 2 and 2.5 quarts of fluid in your diff. you are probably safe.

TMSBOSS · Sep 3, 2017

Be sure to fill to the front plug. Overfill will lead to overheat and fluid pushed out.

gripdriver · Sep 3, 2017

Doh, i used the fill hole on the cover. Tomorrow ill open up the diff housing fill hole and bleed out some fluid.

Thanks guys!

F.D. Sako · Sep 3, 2017

Yeah, I just fill from the front plug until it starts dripping out.

Grant 302 · Sep 4, 2017

Specs I quoted are from the front plug. You are way overfilled for the top hole on the diff cover.

gripdriver · Sep 4, 2017

Got it taken care of today. Now all 3 magnetic plugs are clean as well. Haha

Next is the diff expansion tank/breather.

ArizonaBOSS · Sep 6, 2017

You must be going to NASA @ Bondurant West this Saturday. I'd hoped to stop out there but I'll be busy in my garage prepping for my next event in October.

Here is some video of the track going clockwise.

Good luck out there!

gripdriver · Sep 6, 2017

ArizonaBOSS said:
You must be going to NASA @ Bondurant West this Saturday. I'd hoped to stop out there but I'll be busy in my garage prepping for my next event in October.

Here is some video of the track going clockwise.

Good luck out there!

Yes i am. I am planning to attend more track days during the "cool" months in AZ, so ill probably see you out there.

Thanks for the video. Ill watch it later tonight after i plumb up all my new Fragola fittings to the rear end.

steveespo · Sep 7, 2017

3 quarts way too much and will puke out. 2.55 quarts or 1/4" down from front nose plug with car sitting level on jack stands under the suspension/axle. If it is in droop you will overfill.

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How much gear oil did your diff take?

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Grant 302

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Grant 302

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Grant 302

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