How many quarts of gear oil?

ANDYS87 · 05-05-2008, 06:59 AM

I have a Ford racing rear end girdle/cover on my 99 GT. Last time I changed the gear oil, I used the stock fill hole and added a little over 2 quarts before it started to come out(if I remember correctly). This time, I decided to save the mess(the factory fill plug is in a bad spot) and use the fill hole on the girdle. Here is the problem....I added 3 quarts, and it still wasn't coming out....so I added about 3/4 of another quart, and still not full! I then realized(duh) that the factory fill hole is way lower than the one on the ford racing cover. I didn't feel right about having that much in there, so i took out the 3/4 of a quart that I added. So, my rear end now has about 3 full quarts of gear oil in it. Is this still too much?????? I took for a test drive and it feels fine...also no leaks. Not leaking out of vent either. Just wondering if I still over filled it....also wondering why the ford cover has a fill hole so high up compared to the stock one. Thanks

JScottGT · 05-05-2008, 07:04 AM

Factory fill is between 1.8-2Q... 3 is too much.

TUFF 4.6 · 05-05-2008, 07:22 AM

2 qts and youll be just right. Drain a little more out so that you dont blow any of your seals out.

V6_Mustang_Power · 05-05-2008, 07:56 AM

ANDYS87 · 05-05-2008, 09:22 AM

Thanks guys! Glad I checked before I did any damage.

ANDYS87 · 05-06-2008, 06:54 AM

Does that Ford Performance girdle add any capacity? Or is it the same as the stock cover? I thought I saw it somewhere that aftermarket covers or girdles add 1/2 quart extra capacity.

*Randy Stinchcomb* · 05-06-2008, 07:04 AM

Quote:

Originally Posted by ANDYS87

Does that Ford Performance girdle add any capacity? Or is it the same as the stock cover? I thought I saw it somewhere that aftermarket covers or girdles add 1/2 quart extra capacity.

you've answered your own question, @3qts wth an aftermarket cover/girdle....

ANDYS87 · 05-06-2008, 09:16 AM

Randy,

That Ford Racing Girdle really adds an extra quart to the capacity??? I thought it was 1/2 quart?

Ok, now I'm really confused. Everyone has a diff answer!

*Randy Stinchcomb* · 05-06-2008, 09:30 AM

no, I said @bout 3qts total....normal diff fluid change is @2.4qts wth the friction modifier and the girdle adds @bout 1/2 qt so that @2.9 qts

96TangerineBossGT · 05-06-2008, 05:42 PM

Just fill it up with the stock fill plug out and stop when the fluid start running out. Of course the girdle adds some capacity, as it is bigger (sticks out further) than the stock cover. Randy is correct (as usual) about the capacity. I just changed my fluid a couple of weeks back and I have that same cover.

Scott

ANDYS87 · 05-07-2008, 06:39 AM

I'm gonna have to do what I wanted to avoid....open the factory fill hole and make a mess. Right now, I probably have about 2.5 quarts in there. If that's too much, I have a stinky mess....if too little I will add more. God I hate the smell of gear oil!

ANDYS87 · 05-15-2008, 06:49 AM

Randy was right. I had about 2.5 quarts in there. Removed the factory fill plug and nothing came out. Added close to another 1/2 quart. So, the total fill was close to 3 quarts. Next time, I'm just gonna add 3 quarts and avoid the mess.

Thanks guys

05-05-2008, 06:59 AM	#1 (permalink)
ANDYS87 Member Join Date: Dec 2006 Posts: 97	How many quarts of gear oil? I have a Ford racing rear end girdle/cover on my 99 GT. Last time I changed the gear oil, I used the stock fill hole and added a little over 2 quarts before it started to come out(if I remember correctly). This time, I decided to save the mess(the factory fill plug is in a bad spot) and use the fill hole on the girdle. Here is the problem....I added 3 quarts, and it still wasn't coming out....so I added about 3/4 of another quart, and still not full! I then realized(duh) that the factory fill hole is way lower than the one on the ford racing cover. I didn't feel right about having that much in there, so i took out the 3/4 of a quart that I added. So, my rear end now has about 3 full quarts of gear oil in it. Is this still too much?????? I took for a test drive and it feels fine...also no leaks. Not leaking out of vent either. Just wondering if I still over filled it....also wondering why the ford cover has a fill hole so high up compared to the stock one. Thanks

05-05-2008, 07:04 AM	#2 (permalink)
JScottGT Member Join Date: Mar 2008 Location: Farmington Hills, MI Posts: 62	Factory fill is between 1.8-2Q... 3 is too much. __________________ 2000 Mustang GT (aka "The Frankenstang") - 5.4L Power - Comp XE270AH-13 Cams - 261rwhp/330rwtq - 2001 Cobra IRS - 3.55:1 - 2000 Cobra R Rear Springs & Dampers - 2001 Bullitt Front Springs & Dampers - 2001 Bullitt Front Brakes www.jscottgt.com

05-05-2008, 07:22 AM	#3 (permalink)
TUFF 4.6 Senior Citizen Join Date: Dec 2007 Location: Richmond Va. Posts: 652	2 qts and youll be just right. Drain a little more out so that you dont blow any of your seals out. __________________ Last edited by TUFF 4.6 : 05-05-2008 at 07:24 AM.

05-06-2008, 09:30 AM	#9 (permalink)
Randy Stinchcomb Super Moderator Join Date: Aug 2005 Location: Randallstown, Md Posts: 2,753	no, I said @bout 3qts total....normal diff fluid change is @2.4qts wth the friction modifier and the girdle adds @bout 1/2 qt so that @2.9 qts __________________ Randy Stinchcomb contact info: Liberty Ford of Baltimore 410-655-2000 parts ext 5618 like to fish visit us at www.sportfisherman.com need fishing tackle www.binnacletackle.com

05-06-2008, 05:42 PM	#10 (permalink)
96TangerineBossGT Senior Member Join Date: Aug 2005 Location: Charlotte, NC Posts: 443	Just fill it up with the stock fill plug out and stop when the fluid start running out. Of course the girdle adds some capacity, as it is bigger (sticks out further) than the stock cover. Randy is correct (as usual) about the capacity. I just changed my fluid a couple of weeks back and I have that same cover. Scott __________________ 96 GT Mods: VT Stage IIs, Stage 2.5 Ported PI heads from New Kid Cylinder Head in Kansas City, PI Intake, BBK Plenum, BBK 75mm Throttlebody, BBK Fenderwell Cold-Air, 3.55s, Steeda Tri-Ax, SCT PRP Tune, FRPP Shorties, BBK Off-Road H, Flowmaster Catback, Steeda Adj./Quad., 180* tstat, Fidanza Aluminum Flywheel, McLeod performance clutch

05-05-2008, 07:56 AM	#4 (permalink)
V6_Mustang_Power Banned Join Date: Dec 2007 Posts: 1,808	2

05-05-2008, 09:22 AM	#5 (permalink)
ANDYS87 Member Join Date: Dec 2006 Posts: 97	Thanks guys! Glad I checked before I did any damage.

05-06-2008, 06:54 AM	#6 (permalink)
ANDYS87 Member Join Date: Dec 2006 Posts: 97	Does that Ford Performance girdle add any capacity? Or is it the same as the stock cover? I thought I saw it somewhere that aftermarket covers or girdles add 1/2 quart extra capacity.

05-06-2008, 09:16 AM	#8 (permalink)
ANDYS87 Member Join Date: Dec 2006 Posts: 97	Randy, That Ford Racing Girdle really adds an extra quart to the capacity??? I thought it was 1/2 quart? Ok, now I'm really confused. Everyone has a diff answer!

05-07-2008, 06:39 AM	#11 (permalink)
ANDYS87 Member Join Date: Dec 2006 Posts: 97	I'm gonna have to do what I wanted to avoid....open the factory fill hole and make a mess. Right now, I probably have about 2.5 quarts in there. If that's too much, I have a stinky mess....if too little I will add more. God I hate the smell of gear oil!

05-15-2008, 06:49 AM	#12 (permalink)
ANDYS87 Member Join Date: Dec 2006 Posts: 97	Randy was right. I had about 2.5 quarts in there. Removed the factory fill plug and nothing came out. Added close to another 1/2 quart. So, the total fill was close to 3 quarts. Next time, I'm just gonna add 3 quarts and avoid the mess. Thanks guys

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