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Deanj
06-19-2017, 11:49 AM
I'm curious because my transmission has stopped leaking from above where it rests on the cross member. About a year ago I followed directions and drained the transmission and both holes in the torque converter, then added 9 1/2 quarts before filling it to 10 after warming up the transmission.

It leaked before and after servicing. Now it has stopped. Is this possible?

Dean

jopizz
06-19-2017, 12:03 PM
Without knowing exactly where it was leaking it's hard to say. Normally transmissions leak because rubber parts get hard and no longer seal. Sometimes rubber parts will leak in the winter when it's cold and not in the summer when they soften up. If it leaked after you serviced it I suspect it will probably leak again at some point. The most common leak points are the front seal, pan and the shift selector seals. Sometimes it will also leak from the speedometer cable housing. It's usually pretty easy to determine exactly where it's leaking.

John

Deanj
06-19-2017, 01:46 PM
Makes sense John. There goes my excitement. I know it's not the pan. The front seal should have been replaced when the transmission or torque converter were overhauled around 72K and she's almost 82K. Shift selector seals?

Dean

jopizz
06-19-2017, 01:50 PM
The shift selector seals are a very common leak point. They are on the driver side front of the transmission where the shift rods come out so they are easy to spot if they are leaking. If the trans was overhauled they should've been replaced.

John

Tbird1044
06-19-2017, 02:21 PM
Dean:
If it does turn out to be shift linkage seals, (a couple small o-rings) there is a procedure to change these out in the TRL. It's a bit of a PITA, but can be done without dropping the trans. I did it laying on my back and it worked well.
You might try and use some brake clean to degrease the trans and then try to identify the leak source. With only 10K miles on a rebuild, you should still be in good shape.
If the trans sat for a while, you might try some of the trans sealers. They basically are designed to cause the seals to swell. There will probably be a lot of kickback on this one, but I have had limited success using these.
The trans also has a breather vent and you should make sure this somehow didn't get restricted.
Nyles

Deanj
06-20-2017, 11:31 AM
Dean:
If it does turn out to be shift linkage seals, (a couple small o-rings) there is a procedure to change these out in the TRL...
If the trans sat for a while, you might try some of the trans sealers. They basically are designed to cause the seals to swell. There will probably be a lot of kickback on this one, but I have had limited success using these.
The trans also has a breather vent and you should make sure this somehow didn't get restricted.
Nyles

Thanks. You got me on this acronym. What is TRL? Transmission rebuild link? T-Bird Relic lesson? Transport Research Library?

What is the down side of a sealer?

Dean

YellowRose
06-20-2017, 11:39 AM
The last guess is close, but no cigar! TRL stands for the Technical Resource Library (hence TRL!). There is a sub-Forum for it, or you can enter it by clicking on the link that both myself and John ~ jopizz have in our signature elements. There you will find the answers to many questions and tech tips regarding your Tbirds...

Tbird1044
06-20-2017, 04:30 PM
Dean:
The only downside I know of, if you add sealer, is that you spent a couple of bucks for the sealer and the trans keeps leaking. When my shift linkage seals were leaking, I tried some sealer and it really didn't help. The o-rings were beyond any help. As I said, I have seen success in some uses, so I figure it's worth a try.
Nyles

Yadkin
06-20-2017, 07:11 PM
I've used a good quality brand sealer on a Cruise-O with a minor leak and it's still holding after two years.

Deanj
06-21-2017, 10:49 AM
Thanks everyone. I'll check my leak location (again), and check fluid level before I add any sealer to the case.

One last question: At what highest speed is the cruise-O-matic on this car still able to kick down into 2nd gear?

Dean

Yadkin
06-21-2017, 12:52 PM
Thanks everyone. I'll check my leak location (again), and check fluid level before I add any sealer to the case.

One last question: At what highest speed is the cruise-O-matic on this car still able to kick down into 2nd gear?

Dean
My '64 will kick down to second below 60, about. At lower speeds it will kick down two gears.

Deanj
05-02-2018, 11:18 AM
Once again my Cruise-O-Matic is leaking and really good. It leaks from the passenger side right around the filler tube area, and I'd rather hear a possibility or two before hauling it back to the shop that replaced the transmission lines. I know they stuffed more fluid in the case.

Is it likely an overfill on the passenger side? or bogus connection on the lines?

Dean

Tbird1044
05-02-2018, 03:51 PM
Is the trans leaking all the time or only when running and you have pressure on the lines?
If you paid to have the cooler lines replaced, I'd probably take it back, put it up on a hoist, clean the trans area with some brake clean and then check for leakage. First step in fixing the leak is to identify the source.
The reason I asked the first question, is I found a hairline crack in the dipstick tube that was leaking. If the shop tightens the tube, where it attaches to the pan, and then tweaks it a bit to secure the bracket to the rear of the engine, it can stress the tube causing a crack. Just a thought.
Nyles

Deanj
05-02-2018, 10:35 PM
Nyles, it doesn't appear to be leaking under pressure. You're right about that. I've experienced leaking power steering lines under pressure, and they leak real good while the engine is running. This leaks a river while parked.

Shoot. Bringing it back to the shop is inevitable, and a pita.

Dean

Tbird1044
05-02-2018, 11:57 PM
I would definitely look at the dip stick tube and also the connection to the pan.
Nyles

Deanj
05-03-2018, 11:51 AM
Thanks Nyles. The transmission lines are connected on the same side, too, I believe? I remember removing and re-installing the dip stick tube when I changed the fluid. Ironic my gasket and work didn't leak, but now it does.

Dean

Deanj
05-11-2018, 11:53 AM
I inspected the dipstick tube connection on the tranny and it was solid with no leaks. I returned my car to the shop where they said only one transmission line needed tightening. They said they ran it for 20 minutes and no leaks appeared.

Of course there was still ATF on my floor the next day. I can't say whether it was left over from the case, but it seemed too much. The last time I saw this much ATF my father was returning the '58 Biscayne to the dealer for Powerglide service.

I suppose I'll give it a week or two to see if it stops. Definitely on the driver's side.

Dean

simplyconnected
05-11-2018, 02:21 PM
Once again my Cruise-O-Matic is leaking and really good. It leaks from the passenger side right around the filler tube area...

...Of course there was still ATF on my floor the next day. ...Definitely on the driver's side. Ok, which side is it for real? A transmission leak should be easy to detect.

Lay some cardboard under your car from the front bumper to the tail shaft. Park your car over it and MARK the cardboard where your front tires sit.