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Discussion Topic:
Is there a seal in the rear of a 1939 transmission
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moxie1945 |
08-24-2025 @ 2:47 PM
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Member
Posts: 19
Joined: Nov 2024
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Helping a friend on his car and notice a leak on the rear of the transmission. We are working on it while it is still in the car. The rear end and torque tube with bell has been removed. Also removed the end plate that is attached to rear of trans by 6 bolts and I can see no signs of a seal. It looks like fluid can go to the bell with U joint from the trans and maybe that’s how the u joint gets lubed.
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40 Coupe |
08-25-2025 @ 5:53 AM
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Senior
Posts: 1798
Joined: Oct 2009
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Correct the rear bearing retainer does not have a seal, transmission fluid can mix with the U-joint fluid. Suggest changing the trans rear bearing to one with metal shields and remove the inner shield. Also suggest using 0-0 grease to lube the U-Joint. There are gaskets for the rear bearing retainer to the trans and the U-joint cover.
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moxie1945 |
08-25-2025 @ 7:18 AM
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Member
Posts: 19
Joined: Nov 2024
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I noticed the shield you are talking about. Can that bearing be removed with trans in car. Is it press fitted on shaft. I noticed when I remove the back plate the trans shaft with bearing moved out a little so it is loose in the housing. Did not move it anymore as i was concerned the inside gear would move loose and then not able to put back in place, thanks
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40 Coupe |
08-26-2025 @ 6:48 AM
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Senior
Posts: 1798
Joined: Oct 2009
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The bearing is a tight fit over the trans main output shaft. If the bearing in the trans is good don't replace. If your going to remove the trans and rebuild then replace all the bearings. Replace all of the gaskets should be good to solve some leaks. The Ford transmissions are very prone to leak at the rear around the two shafts and the long pin that retains the shafts. About all you can do without much work is to clean and work some RTV into the rear of the shafts and where the long pin enters the housings.
This message was edited by 40 Coupe on 8-26-25 @ 6:54 AM
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40 Coupe |
08-27-2025 @ 5:24 AM
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Senior
Posts: 1798
Joined: Oct 2009
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After rereading your previous posting: There is a metal shield inside the transmission just before the front and rear bearings. These shields are not what I described in my previous post regarding bearings with shields. The rear bearing is available new with double metal shields built onto the bearing. If you do not want the trans fluid to mix with the U-joint fluid then a new bearing with the double metal shield will do this, but the new bearing inner shield has to be pried off the bearing so the new bearing can be lubed by the trans fluid. Keep both of the original Ford metal shields inside the transmission in place.
This message was edited by 40 Coupe on 8-27-25 @ 5:27 AM
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moxie1945 |
08-27-2025 @ 7:56 AM
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Member
Posts: 19
Joined: Nov 2024
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Thanks for your time in answering my questions. Since the bearing is a press pit and can not be removed while in car i will wait and replace when the time comes to pull transmission, again thanks.
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