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Old 11-08-2017, 07:13 PM   #1
philipswanson
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Default 40 Ford Rear Axle Grease Seals

I am having allot of trouble finding the right rear axle grease seal for my '40 wagon. I have bought two sets and neither is correct. Does anyone have a good number for this seal. My rear hubs are the kind that gets installed from the inside. They are the originals.
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Old 11-08-2017, 08:36 PM   #2
Ken/Alabama
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Default Re: 40 Ford Rear Axle Grease Seals

Are you needing axle seals or hub seals? Axle seals fit inside the axle housing.
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Old 11-08-2017, 09:25 PM   #3
Lakewood
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Default Re: 40 Ford Rear Axle Grease Seals

The Ford number is (4245), Macs have it as B4245, this same seal is used on the drive shaft at the gearbox end just behind the roller bearing. These are fitted in the axle housing, hope this is what you mean.
They are installed by inserting in the large end of the axle housing and pulled out toward the narrow (wheel) end. Macs have a nifty tool for this No. A4246.

Last edited by Lakewood; 11-08-2017 at 09:35 PM.
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Old 11-08-2017, 10:16 PM   #4
philipswanson
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Default Re: 40 Ford Rear Axle Grease Seals

Looking for the seal that fits inside the hub and rides on the axle when assembled. Didn't know there was a second seal. Where is it? How far inside the end of the housing does it sit???
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Old 11-08-2017, 11:57 PM   #5
Lakewood
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Default Re: 40 Ford Rear Axle Grease Seals

Apparently you are looking for the large seal that rides on the outer of the axle housing which is actually the inner surface of the large roller bearing assy (the wheel bearing), this seal stops the grease escaping to the brake drum area.
The 4245 is a much smaller diameter and is pressed into the inner of the axle housing and rides on the axle and stops the grease migrating down the central cavity of the axle housing and eventually into the diff. This seal is visible from the outside when the hub is taken off.
I am not sure on this but the number I have is 78-1175 and it should be 2.84" OD from Dennis Carpenter.
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Old 11-09-2017, 01:17 AM   #6
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Default Re: 40 Ford Rear Axle Grease Seals

1928-1948 Front outer bearing BCA/Bower #09074
1928-1948 Front outer race BCA/Bower #09196
1928-1948 Front inner bearing BCA/Bower #15118
1928-1948 Front inner race BCA/Bower #15250X
1935-1948 Front wheel seal National Seal #5796
1934-1950 Rear wheel outer bearing BCA/Bower #462
1928-1937 Rear wheel seal National Seal #450096
1938-1948 Rear wheel seal National Seal #5877
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Old 11-09-2017, 06:35 AM   #7
PeteVS
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Default Re: 40 Ford Rear Axle Grease Seals

All of the seals in the rear end are "lip" seals. The cross section of the seals have a "V" shape. If pressure is applied to the "top" of the V, that pressure will push the sides out which will prevent any leakage in that direction. If pressure was applied to the "bottom" of the V, that would push in on the sides allowing grease or oil to leak past it. In all of the seals, hub, axle and driveshaft, the seals should be installed to keep grease or oil from flowing towards the brakes, thus allowing it to leak towards the transmission. So, hub grease is kept from leaking into the brakes and is allowed to leak towards the axle seal. The axle seal keeps differential oil from leaking into the hub bearing and allows hub grease to leak into the differential housing. The driveshaft seal keeps universal grease from leaking into the differential housing and allows differential oil to leak into the universal. The transmission should allow any pressure to leak to atmosphere. If a rear end is converted to open drive shaft, the differential housing must be vented to atmosphere at the top. All of this keeps the brakes dry!
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Old 11-09-2017, 09:04 AM   #8
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Default Re: 40 Ford Rear Axle Grease Seals

Looks like you have been ordering axle seals and not hub seals.
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Old 11-09-2017, 10:46 AM   #9
Bob C
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Default Re: 40 Ford Rear Axle Grease Seals

Quote:
Originally Posted by philipswanson View Post
Looking for the seal that fits inside the hub and rides on the axle when assembled. Didn't know there was a second seal. Where is it? How far inside the end of the housing does it sit???
This shows the seals

Bob
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Old 11-09-2017, 11:47 AM   #10
39DLXE All Orig
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Default Re: 40 Ford Rear Axle Grease Seals

Mac's carries that rear wheel outer grease seal 2.84" part #32-17437-1.
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Old 11-09-2017, 02:15 PM   #11
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Default Re: 40 Ford Rear Axle Grease Seals

We buy them from C&G. For 38-48 ask for 78-1175. That is for 2.78" O.D. Good seals have a red coating on the shell of the seal. We bought some uncoated seals locally, and they collapsed before the could be driven into place. 800/266-0470
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Old 11-11-2017, 06:37 PM   #12
philipswanson
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Default Re: 40 Ford Rear Axle Grease Seals

Can the smaller, inner seal be replaced from the outside without taking the axle housing apart? How far in would you set it? Might as well replace it since I got those by mistake but I don't want to take the whole axle apart.

Thanks, Phil Swanson
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Old 11-11-2017, 06:42 PM   #13
john in illinois
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Default Re: 40 Ford Rear Axle Grease Seals

No you have to take axle apart and replace seals from inside.

John
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Old 11-11-2017, 07:40 PM   #14
19Fordy
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Default Re: 40 Ford Rear Axle Grease Seals

Philip: If it ain't broke, don't fix it. Taking the rear apart is a lot of work and putting it back together correctly can be tricky.
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Old 11-12-2017, 07:54 PM   #15
richard crow
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Default Re: 40 Ford Rear Axle Grease Seals

there is an after market seal that you can install with out taking the axle apart. i think a gentleman on the barn called barn find sells them.look up one of his listing & p.m him
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Old 11-12-2017, 08:10 PM   #16
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Default Re: 40 Ford Rear Axle Grease Seals

We have a "barnfind" and a "barnfind08" on here. The latter is Fred Wilner at Southside Obsolete who sells parts,, so it might be him.
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Old 11-12-2017, 09:07 PM   #17
Binkman34
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Default Re: 40 Ford Rear Axle Grease Seals

I have 6 of the seals left over from my convertible days.
I used 2 of them until I was able to tear into the rear axle.
The stopped the leak.
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Old 03-10-2020, 11:47 PM   #18
Will D
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Default Re: 40 Ford Rear Axle Grease Seals

Anyone know how to get a hold of Binkman34? I need 2 of these seals!
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Old 03-10-2020, 11:50 PM   #19
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Default Re: 40 Ford Rear Axle Grease Seals

Being he's banned. Might want to look at barnfind08 as tubman mentioned.
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Old 03-11-2020, 08:16 AM   #20
Seth Swoboda
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Default Re: 40 Ford Rear Axle Grease Seals

Or contact Michael Driskell at Thrid Gen Automotive 844-327-5988. He has every part you need to rebuild a rear end.
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