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1965 a904 output shaft seal & trunnion boot replacement
https://slantsix.org/forum/viewtopic.php?f=20&t=63788		 Page 1 of 1
Author:  225BigBlock [ Tue Jul 02, 2019 9:20 pm ]
Post subject:  1965 a904 output shaft seal & trunnion boot replacement
Dried up output seal and resulting fluid leak led me to my latest adventure, replacing the output shaft seal on my 1965 Valiant's a904. This seal (TF6 CT6392 12925A or # 12925A), didn't last long and I thought I'd give this seal (National 472466 Oil Seal) a try. Cheap and easy solution is what I strive for. Trunnion boot was ripped and so I thought this was a good opportunity to get that fixed up as well. I can't speak for anyone else's experiences, but all this talk I've run into about needing a press to disassemble the Trunnion joint seems silly. I found that it has a bearing surface and simply pushed out with a small vice. Removed the pin and replaced the old cracked boot with a new style CV boot, it needed modification but ended up working perfectly. Simply trimmed it with a razor blade. (All Balls 19-5008 Black 17mm x 60mm x 81mm Long CV Boot Kit) https://www.amazon.com/dp/B019QFHRZA/re ... hDbYAX241F
Total spent: $18.28

Attachments:
Trunnion boot installed.jpg
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1965 a904 output seal.jpg
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Author:  Charrlie_S [ Wed Jul 03, 2019 3:54 am ]
Post subject:  Re: 1965 a904 output shaft seal & trunnion boot replacement
Thanks. I'm going to try this on my 64 Valiant 3 speed stick. I usually convert to a "normal" U-joint, but don't have the funds right now. Don't like to use NOS boots, as they are so old the rubber doesn't last.
Author:  SpaceFrank [ Wed Jul 03, 2019 8:05 am ]
Post subject:  Re: 1965 a904 output shaft seal & trunnion boot replacement
Glad to see there's another good manufacturer P/N for that '65 output seal (National 472466). I used an SKF 14858 when I did the rear seal in my '65 A904.
Author:  watsonwerks [ Sat Jul 06, 2019 2:43 pm ]
Post subject:  Re: 1965 a904 output shaft seal & trunnion boot replacement
Thanks for the trunnion boot tip. Ordered one up, hope it fits my 64 270, looks like it will. I got a "stock" one a while ago and it disintegrated very quickly.
Author:  valiant_200 [ Fri Dec 06, 2019 11:34 pm ]
Post subject:  Re: 1965 a904 output shaft seal & trunnion boot replacement
I can vouch for this. As a result of reading this thread, I just installed a National 472466 seal in my 65 Valiant and it fit perfectly and sealed it tight. No more leaking from the output shaft, ending literally years of puddles under my car.

In order to replace the seal, I had to make a tool to hold the flange in place while I wrenched that huge serrated nut and washer off with a large cheater bar.

The seal I removed was the stock, factory seal. At the tender age of 55, it is no wonder why it was leaking uncontrollably. As you can see, the replacement is a little thinner than the stock part, but it works just fine. The tool made it possible to remove the flange without the danger of damaging the park mechanism. Big thanks to 225bigblock for finding this part.

I have also purchased one of the boots discussed in this thread, but I haven't had a chance to actually get down and dirty replacing the crusty remains of my trunnion boot yet. I will report back when I do, but I fully expect that to be a success as well.

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transmission seals old and new.jpg
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transmission tool_01.jpg
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Author:  valiant_200 [ Tue Jul 21, 2020 1:07 am ]
Post subject:  Re: 1965 a904 output shaft seal & trunnion boot replacement
Unfortunately, a sad update to this thread. 7 months since the Vega seal was installed. It held for a while, but I am getting drips from the tail shaft again. Not as bad as the crusty 55 year old seal dripped, but enough to make me put down a piece of cardboard on the garage floor.

So.., back to square one. The original seal is a good bit thicker than the Vega seal. Could that be a factor?
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