The Ford Barn

christian · 06-19-2013, 02:08 PM

A few weeks ago I drained and filled my gearbox. I filled it up till it came out the top fill plug. Every time I drive it I have been getting a sizable leak just under the rear of the gear box. Could this be from over filling? Trying to find its natural level? Or could this be a leak somewhere to the output of the gear box. Thanks for looking.

1crosscut · 06-19-2013, 02:14 PM

Have you checked the level of the differential? Could be the drive shaft seal is bad and it is migrating from there.

Patrick L. · 06-19-2013, 02:22 PM

When you drained the transmitter, was it low ? Everyone tends to fill until the oil comes back out the fill hole. Thats fine, but, it does leave it a bit over filled. If the rear transmission bearing is an original non-sealed bearing then the oil will migrate into the u-joint assembly ,as it should, and mix with the grease. So, its suppose to leak a little bit.

Keith True · 06-19-2013, 02:49 PM

Make sure the vent on the tower is open.Once it has been filled with old grease,hardened up,and painted a few times it will be hard to find.I just showed on to s fellow,he swore up and down he had searched and it just wasn't there.I climbed in the truck with a DA,hit the side of the tower with 80 grit,and a big black dot jumped right out of the bare metal.He'd been telling me he had been searching and scratching on that tower looking but I could see he had not gotten too serious about it.There were no scratches in his pretty paint.Make sure you have enough grease in the U-joint housing too,that will help keep the relatively thin gear oil in the car.

Fred K-OR · 06-19-2013, 03:02 PM

Isn't there a plate of some sort a person can install on the rear of the tranny that goes over the end of a couple of shafts? This plate, the way I hear it, is suppose to stop rear end tranny leaks. People with more knowledge than I on the item could comment on this.

Patrick L. · 06-19-2013, 03:04 PM

Sponsored Links (Register now to hide all advertisements)

Good point about the vent !

christian · 06-19-2013, 03:15 PM

didnt even know there was a vent, i'll have to bring up the floorboards and take a look.

Louis · 06-19-2013, 03:36 PM

[QUOTE=christian;673623]A few weeks ago I drained and filled my gearbox. I filled it up till it came out the top fill plug. Every time I drive it I have been getting a sizable leak just under the rear of the gear box. Could this be from over filling? Trying to find its natural level? Or could this be a leak somewhere to the output of the gear box. Thanks for looking.

Did it leak before you re serviced it ?...The level dose not have to be at the very top [running out] if you can reach it with your index finger, it's ok, same as your eng. oil, better to be a little low [1/2 qt.] then over serviced. JMO.

Mitch//pa · 06-19-2013, 03:47 PM

here is a pic of the vent hole below my finger

christian · 06-19-2013, 05:00 PM

thanks for the pic, i spent a half hour looking blind, i was in the wrong place. Found it, and yes it was plugged solid.

Mitch//pa · 06-19-2013, 05:13 PM

thats good news

Tom Wesenberg · 06-19-2013, 09:36 PM

I use a drill bit and twist it with my fingers while holding a vacuum cleaner hose next to the hole, so the dirt is sucked away rather than into the hole.

06-19-2013, 02:08 PM	#1
christian Senior Member Join Date: Aug 2012 Location: Central NJ Posts: 238	Gearbox over filled ? A few weeks ago I drained and filled my gearbox. I filled it up till it came out the top fill plug. Every time I drive it I have been getting a sizable leak just under the rear of the gear box. Could this be from over filling? Trying to find its natural level? Or could this be a leak somewhere to the output of the gear box. Thanks for looking. __________________ 1931 Slant Windshield fordor

06-19-2013, 02:14 PM	#2
1crosscut Senior Member Join Date: Feb 2011 Location: Lincoln, Nebraska Posts: 1,909	Re: Gearbox over filled ? Have you checked the level of the differential? Could be the drive shaft seal is bad and it is migrating from there. __________________ Dave / Lincoln Nebraska

06-19-2013, 02:22 PM	#3
Patrick L. Senior Member Join Date: May 2010 Location: Largo Florida Posts: 7,225	Re: Gearbox over filled ? When you drained the transmitter, was it low ? Everyone tends to fill until the oil comes back out the fill hole. Thats fine, but, it does leave it a bit over filled. If the rear transmission bearing is an original non-sealed bearing then the oil will migrate into the u-joint assembly ,as it should, and mix with the grease. So, its suppose to leak a little bit.

06-19-2013, 02:49 PM	#4
Keith True Senior Member Join Date: May 2010 Location: Epping N.H. Posts: 2,989	Re: Gearbox over filled ? Make sure the vent on the tower is open.Once it has been filled with old grease,hardened up,and painted a few times it will be hard to find.I just showed on to s fellow,he swore up and down he had searched and it just wasn't there.I climbed in the truck with a DA,hit the side of the tower with 80 grit,and a big black dot jumped right out of the bare metal.He'd been telling me he had been searching and scratching on that tower looking but I could see he had not gotten too serious about it.There were no scratches in his pretty paint.Make sure you have enough grease in the U-joint housing too,that will help keep the relatively thin gear oil in the car.

06-19-2013, 03:02 PM	#5
Fred K-OR Senior Member Join Date: May 2010 Location: Stayton, Oregon Posts: 3,806	Re: Gearbox over filled ? Isn't there a plate of some sort a person can install on the rear of the tranny that goes over the end of a couple of shafts? This plate, the way I hear it, is suppose to stop rear end tranny leaks. People with more knowledge than I on the item could comment on this. __________________ Fred Kroon 1929 Std Coupe 1929 Huckster

06-19-2013, 03:04 PM	#6
Patrick L. Senior Member Join Date: May 2010 Location: Largo Florida Posts: 7,225	Re: Gearbox over filled ? Sponsored Links (Register now to hide all advertisements) Good point about the vent !

06-19-2013, 03:15 PM	#7
christian Senior Member Join Date: Aug 2012 Location: Central NJ Posts: 238	Re: Gearbox over filled ? didnt even know there was a vent, i'll have to bring up the floorboards and take a look. __________________ 1931 Slant Windshield fordor

06-19-2013, 03:36 PM	#8
Louis Senior Member Join Date: May 2010 Location: Marietta GA. Posts: 647	Re: Gearbox over filled ? [QUOTE=christian;673623]A few weeks ago I drained and filled my gearbox. I filled it up till it came out the top fill plug. Every time I drive it I have been getting a sizable leak just under the rear of the gear box. Could this be from over filling? Trying to find its natural level? Or could this be a leak somewhere to the output of the gear box. Thanks for looking. Did it leak before you re serviced it ?...The level dose not have to be at the very top [running out] if you can reach it with your index finger, it's ok, same as your eng. oil, better to be a little low [1/2 qt.] then over serviced. JMO. __________________ I've suffered a great many Catastrophe's in my life.....most of them never Happened.

06-19-2013, 05:00 PM	#10
christian Senior Member Join Date: Aug 2012 Location: Central NJ Posts: 238	Re: Gearbox over filled ? thanks for the pic, i spent a half hour looking blind, i was in the wrong place. Found it, and yes it was plugged solid. __________________ 1931 Slant Windshield fordor

06-19-2013, 05:13 PM	#11
Mitch//pa BANNED Join Date: May 2010 Location: Bucks County, PA Posts: 11,454	Re: Gearbox over filled ? thats good news

06-19-2013, 09:36 PM	#12
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: Gearbox over filled ? I use a drill bit and twist it with my fingers while holding a vacuum cleaner hose next to the hole, so the dirt is sucked away rather than into the hole.