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A-727 Blows Seals from Accelerating Hard?
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Author:  bwhitejr [ Wed Mar 29, 2006 3:44 pm ]
Post subject:  A-727 Blows Seals from Accelerating Hard?
Can you blow a seal in a rebuilt A-727 by accelerating hard? If that is true, they are pretty flimsy. How do people use these things in competition? Granted the competition ones are not stock, but is this that common?

bwhitejr
Author:  SlantSixDan [ Wed Mar 29, 2006 4:16 pm ]
Post subject:  Re: A-727 Blows Seals from Accelerating Hard?
Quote:
Can you blow a seal in a rebuilt A-727 by accelerating hard?
No, not unless the seal's defective or improperly installed, or there's another problem in the transmission.
Quote:
If that is true, they are pretty flimsy. How do people use these things in competition?
Riiight, they're "flimsy". :roll:

Find and fix the problem, and the "flimsiness" will go away.
Author:  bwhitejr [ Wed Mar 29, 2006 4:37 pm ]
Post subject:  A-727 Blows Seals from Accelerating Hard?
SSDan,
The transmission place called and said they were going to cover the transmission they rebuilt as a warranty item, but they had serious doubts about it being any parts failing that they installed. They noticed that the wheel wells had particles of rubber in them and that the rear tires were definetly worn more than the same ones on the front. My son tells me that he has done a few burnouts, but never dropped it in drive with the revvs up. I suspect he has held it in 1st longer than I would have. I thought it would take some of the above abuse.

bwhitejr
Author:  SlantSixDan [ Wed Mar 29, 2006 5:10 pm ]
Post subject:  Re: A-727 Blows Seals from Accelerating Hard?
Quote:
The transmission place called and said they were going to cover the transmission they rebuilt as a warranty item
*Whew!*
Quote:
They noticed that the wheel wells had particles of rubber in them and that the rear tires were definetly worn more than the same ones on the front.
Crud! You're supposed to clean that stuff up and practice your innocence-face before you take it in! ;-)
Quote:
My son tells me that he has done a few burnouts, but never dropped it in drive with the revvs up.
H'mmm...
Author:  CStryker [ Wed Mar 29, 2006 5:10 pm ]
Post subject: 
Even if he /has/ been doing neutral drops, I think a seal would be the least likely failure point... I would tend to blame a defective/improperly installed seal.
Author:  Jeb [ Wed Mar 29, 2006 6:09 pm ]
Post subject: 
The 727 Torqueflite is the one of the best transmissions ever. It is even better than the Ford C-6, which is tough as nails.

An internal leak could have developed, internally pressurizing the case and blowing fluid out everywhere. I have seen this happen on Ford C-4 before. It had fluid coming out of the shift levers holes, torque convertor seals, and the tailshaft. Not a little bit, a LOT.
Author:  Slant440 [ Fri Mar 31, 2006 5:02 am ]
Post subject: 
I have the same tranny and I know it is tough, even if he was doing neutral drops it should have no problem handling that. I have done it in my 85 pickup and it has handled it just fine. so that shouldn't be the problem.
Author:  440_Magnum [ Wed Apr 05, 2006 3:14 pm ]
Post subject:  Re: A-727 Blows Seals from Accelerating Hard?
Quote:
Can you blow a seal in a rebuilt A-727 by accelerating hard? If that is true, they are pretty flimsy. How do people use these things in competition? Granted the competition ones are not stock, but is this that common?

bwhitejr

Hard acceleration doesn't put any more stress on the external seals than normal acceleration. What are the exact symptoms here?

As far as neutral "drops" go- that's a good way to kill ANY automatic. The overrunning clutch isn't made to take that kind of impact loading, and you can grenade the aft end of the case that way (pretty common on 904s, 727ss are a LOT tougher in that area but still not made to take deliberate abuse). Reverse drops will break the reverse band, but aren't as likely to shatter the case.

Holding in first to high RPM- that's tougher on the engine than on the transmission.
Author:  Lars [ Wed Apr 05, 2006 5:51 pm ]
Post subject: 
Over filling the tranny with fluid will blow the seals also.
Author:  slantzilla [ Thu Apr 06, 2006 4:04 am ]
Post subject: 
Plugged vent. :shock:
Author:  bwhitejr [ Thu Apr 06, 2006 4:53 am ]
Post subject:  A-727 Blows Seals from Accelerating Hard?
The transmission shop called (it has taken them 2 weeks). They said they have replaced the seal and are driving it, but now think that the torque converter is the real problem and has been the problem all along.

I guess when it is warranty work, they spend more time trying to prove it was abuse on the part of the owner of the vehicle than fixing the car. Also I think you are not a priority. *&^%!! 2 weeks and I still don't have the car back. :x

bwhitejr
Author:  Doctor Dodge [ Thu Apr 06, 2006 6:44 am ]
Post subject: 
What seal is "blowing", the front seal?
One of the valves in the valve body is for oil pump pressure relief, if that valve is stuck shut or set too high (wrong spring installed) then the front seal would get hit with excessive pressure, especially at high engine RPMs.

As others have noted, a 727 is a strong trans. and if build right, it will handle anything you can throw at it.
DD
Author:  bwhitejr [ Thu Apr 06, 2006 9:07 am ]
Post subject:  A-727 Just dumped all of it's fluid on the ground!!!!!!!!!!!
Is it hard to rebuild a A-727? It sure looks like a lot of parts, springs, valve and the like. Is that a home garage mechanic type job?

Just in case I have to do it my self. :shock:

bwhitejr
Author:  CStryker [ Thu Apr 06, 2006 1:17 pm ]
Post subject:  Re: A-727 Just dumped all of it's fluid on the ground!!!!!!!
Quote:
Is it hard to rebuild a A-727? It sure looks like a lot of parts, springs, valve and the like. Is that a home garage mechanic type job?
I rebuilt mine in my basement when I was 16.... trust me, it ain't that bad. I went and bought a book off Amazon, Tourqeflite A-727 Transmission Handbook by Carl Munroe, and it has everything broken down and even covers some modification for race usage and sources for hi-po internals. The book is worthwhile just for the read, and after you look it over, you'll probably feel fairly confident in your ability to rebuild it.

One thing though... while understanding all of the internal workings is nice, you don't really need to be able to understand all of it to rebuild it. It basically just boils down to putting things back where you found them.
Author:  emsvitil [ Thu Apr 06, 2006 3:35 pm ]
Post subject: 
A vacationing penguin is driving through Arizona when the transmission starts to slip. He gets out to look and sees oil dripping out of the tranny. He limps to the nearest town and stops at the first gas station. After dropping the car off, the penguin goes for a walk around town.

He sees an ice-cream shop and, being a penguin in Arizona, decides that something cold would really hit the spot. He gets a big dish of vanilla ice cream and sits down to eat. Having no hands, he makes a real mess trying to eat with his little flippers.

After finishing his ice cream, he goes back to the gas station and asks the mechanic if he's found the problem.

The mechanic looks up and says, "It looks like you blew a seal."

"No, no," the penguin replies, "it's just ice cream."
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