Rear diff oil capacity…at 3.2qts?

[Hollowdweller]

Got the pin hammered back into the carrier and all buttoned up. Currently I’m at 3-3.2qts of oil and still can’t feel it with my pinky…? I do have the FRPP cover and read somewhere they hold extra oil for cooling..? Not sure what to do? Keep adding oil til I can fill it orrrr? Originally I only added the 2qts that came with the gears, maybe it was howling bcz I didn’t have enough oil?

Keep adding oil or just see how it goes with the 3-3.2qts in there?

 

[JC SSP]

I use the front threaded port as the measure of level but I have a stock cover.

 

[Pentalab]

keep filling, till it starts to overflow. AFAIK, that gear oil also lubricates both axles. I have the white line watts link, with the HD aluminum cover...similar to urs, but thicker. It comes with drain and fill plugs. It's filled till it gets to top fill hole. Also have a catch can on the pass side axle. This is on my 2010 GT.

 

[Hollowdweller]

Added another qt…at 4.2qts now and nothing. I did drain the whole housing. Completely removed it from the car and drained it. One guy said it’d hold a lot more bcz of that but didn’t say how much. Cars on jack stands to prob not completely level

 

[Juice]

The front plug in the case is the fill level, not the top plug in the cover. These take 2 1/2 qts +/- to fill.

 

[Hollowdweller]

The front plug in the case is the fill level, not the top plug in the cover. These take 2 1/2 qts +/- to fill.

Not disagreeing with anything your saying sir but why can’t I feel any oil from the top plug of the cover which I “think” is the check hole?

 

[07 Boss]

Not disagreeing with anything your saying sir but why can’t I feel any oil from the top plug of the cover which I “think” is the check hole?

The fill hole is NOT what you use to check the level of the oil. Remove the front plug and add oil until it reaches that point. You can't feel anything from the fill hole because your filling the axel tubes and everything. The proper level for you gear oil should be about to the center of your axles on any differential. The ford 8.8 should take just over 2 qts.

The fill hole on your cover is quite a bit higher than the fill plug on the front. That is why you can't feel any oil. Last time I did my gear oil change I just dropped in 2 qts and 4 oz of friction modifier and called it a day. Never checked the level.

 

[Miker]

I put a 2013 GT500 cover on my 2005. It took just over 3 quarts to have oil come out the level hole which is on the flat part of the housing in front of the cover. I would think any unlevel situation front to back or side to side would affect the measurement but not a quart like you had. Don't use the fill hole on the cover for the full level. Use the one on the housing.


I just looked back of some pics I have and it appears I only had 3 quarts of fluid total and I know I had some left over so my original amount was not right. It appears I put in less than 3 quarts total.
Taken from my file. 10-12-24---MILEAGE 155,200--Replaced diff oil 2.2 qts Lucas 85-140 dino and 1 5oz bottle of Ford friction modifier.

 

[whitmanink]

The fill hole is NOT what you use to check the level of the oil. Remove the front plug and add oil until it reaches that point. You can't feel anything from the fill hole because your filling the axel tubes and everything. The proper level for you gear oil should be about to the center of your axles on any differential. The ford 8.8 should take just over 2 qts.

The fill hole on your cover is quite a bit higher than the fill plug on the front. That is why you can't feel any oil. Last time I did my gear oil change I just dropped in 2 qts and 4 oz of friction modifier and called it a day. Never checked the level.

this is pretty much exactly what i did when i just redid the rear end and put 410 and new axles in,, put in the amount ford states and send it,,

as said above ,, the fill hole in yours is higher than the axle tubes , so you would be filling the axle tubes with fluid and all,, im not sure the seals are ment to seal that much out , lol.

put in what ford says,, maybe a half pump more for keeps sake , and send it ..

 

[Hollowdweller]

The fill hole is NOT what you use to check the level of the oil. Remove the front plug and add oil until it reaches that point. You can't feel anything from the fill hole because your filling the axel tubes and everything. The proper level for you gear oil should be about to the center of your axles on any differential. The ford 8.8 should take just over 2 qts.

The fill hole on your cover is quite a bit higher than the fill plug on the front. That is why you can't feel any oil. Last time I did my gear oil change I just dropped in 2 qts and 4 oz of friction modifier and called it a day. Never checked the level.

Well crap…guess that’s where I’m screwing up. There’s $75 in wasted gear oil. I’ll pull that plug today and let it drain out.

 

[bambam 06]

Make sure to have a container under the plug, to catch the Xtra oil.

 

[Juice]

Just pull the front plug on the housing. When it stops coming out, the diff is full.

 

[Miker]

Now you have some extra chain lube for your motorcycles...

 

[MasterofDisaster]

The manual 205-02B-1 says

In-vehicle repair refill capacities are determined by filling the rear axle with the specified lubricant to 25.4-28.6 mm (1.0-1.125 in) below the bottom of the fill hole with the axle at ride height.

When I checked it about six months ago, lube started pouring from the fill hole. So I guess Ford doesn't worry about it too much.

 

[Dino Dino Bambino]

Just pull the front plug on the housing. When it stops coming out, the diff is full.

This! Just make sure the car is level when you perform the check.

 

[Autokyrios]

Believe the filling procedure is in the vehicle manual, and the online manual, and the FR/Steeda billet covers say not to use the front hole for fluid level checking (least they did when I bought mine).

Good news is all the excess you don't get out will pump its way out the breather...Bad news is it'll pump its way out the breather, all over everything, the road, your driveway, etc.

 

[Pentalab]

Believe the filling procedure is in the vehicle manual, and the online manual, and the FR/Steeda billet covers say not to use the front hole for fluid level checking (least they did when I bought mine).

Good news is all the excess you don't get out will pump its way out the breather...Bad news is it'll pump its way out the breather, all over everything, the road, your driveway, etc.

That's why I installed the catch can on the pass side rear axle on my 2010 GT.

 

[Hollowdweller]

I took it to a shop today so I didn’t have to jack it up and put it on stands and the shop said it was LOW. He could touch it from the housing fill hole but said barely…? 4.2qts in and I’m being told by a shop it’s low….i give up, I hate this car lol

 

[Pentalab]

I took it to a shop today so I didn’t have to jack it up and put it on stands and the shop said it was LOW. He could touch it from the housing fill hole but said barely…? 4.2qts in and I’m being told by a shop it’s low….i give up, I hate this car lol

You are filling up the differential and both axles.

 

[07 Boss]

I took it to a shop today so I didn’t have to jack it up and put it on stands and the shop said it was LOW. He could touch it from the housing fill hole but said barely…? 4.2qts in and I’m being told by a shop it’s low….i give up, I hate this car lol

Dude, you can't put that much oil in there without it flowing out of the hole. Quit using the hole on the cover and pull the plug on the front of the diff. I guarantee you you wont get to even 4 qts. Have you even located the right fill plug?




Do you see how low it is on the housing, it's at about the center of the axles. Pull this plug and fill it through the cover. As soon as it starts to come out of the FRONT hole you're done. It's about as basic a process as you can have. Or just put in 2 qts and 4 oz of friction modifier and send it if you can't figure out how to check it properly.

And don't ever go back to that shop again. They're idiots.

Look, it's over filled now. Just pull that front plug and let it drain out till it stops, then put the plug back in and go.