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How to replace shift shaft seal on 727 trans? #29456
09/02/06 10:37 PM
09/02/06 10:37 PM
Joined: Aug 2003
Posts: 12,589
Sacramento, CA
cal_gecko Offline OP
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Sacramento, CA
the shift shaft seal on the SuperCoupe is leaking pretty bad.. so I picked up a new one tonight, as well as a new trans pan gasket, in case I needed to remove that to get to the seal. ... what's the best way to replace this seal (trans is in the car)?

Re: How to replace shift shaft seal on 727 trans? [Re: cal_gecko] #29457
09/02/06 10:46 PM
09/02/06 10:46 PM

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R U sure it is this seal and not the small kickdown one ?

You can just put a deep pan on it ...and just lower the fluid level.

Re: How to replace shift shaft seal on 727 trans? #29458
09/03/06 12:55 AM
09/03/06 12:55 AM
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Posts: 12,589
Sacramento, CA
cal_gecko Offline OP
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Uh.... no, I'm not sure... I didn't realize there was another seal there for the kickdown... crap. I had to special order the shift shaft seal... I know they won't have the kickdown seal in stock. What's the best way to replace these seals?

Re: How to replace shift shaft seal on 727 trans? [Re: cal_gecko] #29459
09/03/06 01:05 AM
09/03/06 01:05 AM

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Can you see if it is leaking on the high or low part of the shaft ?

The lower seal is a complex one. The upper seal is just a simple rubber one.

How you thought about a deep pan?

Re: How to replace shift shaft seal on 727 trans? [Re: cal_gecko] #29460
09/03/06 01:09 AM
09/03/06 01:09 AM
Joined: Jan 2003
Posts: 402
Dillsburg, PA
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mrsmallblock Offline
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the easiest way is going to be taking the valve body out. remove snap ring and washer to remove and replace the kickdown seal. if you are careful take the kickdown rod out without removing the rooster. then you can polish the shaft because that is what kills that seal, rust and corrosion. the case seal you can knock out from the bottom and use a big c clamp and washer to draw the new seal in. i have done this many times. not too big or a deal.

howard
mrsmallblock

Re: How to replace shift shaft seal on 727 trans? [Re: mrsmallblock] #29461
09/03/06 01:20 AM
09/03/06 01:20 AM
Joined: Aug 2003
Posts: 12,589
Sacramento, CA
cal_gecko Offline OP
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Quote:

the easiest way is going to be taking the valve body out. remove snap ring and washer to remove and replace the kickdown seal. if you are careful take the kickdown rod out without removing the rooster. then you can polish the shaft because that is what kills that seal, rust and corrosion. the case seal you can knock out from the bottom and use a big c clamp and washer to draw the new seal in. i have done this many times. not too big or a deal.

howard
mrsmallblock




what is 'the rooster'? I am not familiar with that term. I guess I'll see if I can get the rubber seal for the kickdown shaft too... I doubt I'll be able to find a parts store that has one in stock though.

Re: How to replace shift shaft seal on 727 trans? #29462
09/03/06 01:21 AM
09/03/06 01:21 AM
Joined: Aug 2003
Posts: 12,589
Sacramento, CA
cal_gecko Offline OP
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Perhaps I should see if I can locate a deep pan... this seems like it's going to be a PITA

Re: How to replace shift shaft seal on 727 trans? [Re: cal_gecko] #29463
09/03/06 01:25 AM
09/03/06 01:25 AM
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Dillsburg, PA
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mrsmallblock Offline
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the rooser is actually the piece that goes through the case seal and the kickdown shaft goes throught the inside of the rooser. it has a check ball and spring that serves as the detent selector for your gears. if you remove the rooster it is a [Edited by Moparts - Keep it clean] to get it back in with the check ball and spring unless you have the tool for it.

howard
mrsmallblock

Re: How to replace shift shaft seal on 727 trans? [Re: mrsmallblock] #29464
09/03/06 01:29 AM
09/03/06 01:29 AM
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Dillsburg, PA
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mrsmallblock Offline
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i got censored for that comment? thats ridiculous. you can't say anything. not like i was directing the comment at somebody.

howard
mrsmallblock

Re: How to replace shift shaft seal on 727 trans? [Re: cal_gecko] #29465
09/03/06 01:40 AM
09/03/06 01:40 AM

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The deep pan is the plan .... just have the fluid show on the TIP of the stick.

Re: How to replace shift shaft seal on 727 trans? #29466
09/03/06 02:14 AM
09/03/06 02:14 AM
Joined: Aug 2003
Posts: 12,589
Sacramento, CA
cal_gecko Offline OP
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Thanks.. I'll give the deep pan a shot.. it'll still shift ok, even if the fluid is low?

Re: How to replace shift shaft seal on 727 trans? [Re: mrsmallblock] #29467
09/03/06 02:42 AM
09/03/06 02:42 AM
Joined: Nov 2004
Posts: 25,050
Texas
GoodysGotaCuda Offline
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#1 of 2. MASSIVE PICTURES (from TF 727 book..)

2893373-100_1020.jpg (1995 downloads)
Re: How to replace shift shaft seal on 727 trans? [Re: GoodysGotaCuda] #29468
09/03/06 02:42 AM
09/03/06 02:42 AM
Joined: Nov 2004
Posts: 25,050
Texas
GoodysGotaCuda Offline
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#2

2893374-100_1022.jpg (2591 downloads)
Re: How to replace shift shaft seal on 727 trans? [Re: GoodysGotaCuda] #29469
09/03/06 03:16 AM
09/03/06 03:16 AM
Joined: Aug 2003
Posts: 12,589
Sacramento, CA
cal_gecko Offline OP
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Thanks, FluffyTwinkie!

Re: How to replace shift shaft seal on 727 trans? [Re: cal_gecko] #29470
09/03/06 03:18 AM
09/03/06 03:18 AM
Joined: Nov 2004
Posts: 25,050
Texas
GoodysGotaCuda Offline
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Quote:

Thanks, FluffyTwinkie!




No problem, its not all that hard to pull the valve body. It is helpful to have someone around thats done it before if you get in a jam though.

Oh and the fluffytwinkie...im thinkin im due for a new name.


1972 Barracuda - 5.7L Hemi, T56 Magnum 6spd - https://www.facebook.com/GoodysGotaHemi
2020 RAM 1500
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Re: How to replace shift shaft seal on 727 trans? [Re: GoodysGotaCuda] #29471
09/03/06 12:46 PM
09/03/06 12:46 PM
Joined: Feb 2003
Posts: 8,658
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Andrewh Offline
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if it is just the selector shaft seal
http://www.mytoolstore.com/kd/kdsusp05.html
Will do it with it still in the car.

Re: How to replace shift shaft seal on 727 trans? [Re: mrsmallblock] #29472
09/03/06 12:49 PM
09/03/06 12:49 PM
Joined: Apr 2006
Posts: 374
Mo.
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Quote:

the rooser is actually the piece that goes through the case seal and the kickdown shaft goes throught the inside of the rooser. it has a check ball and spring that serves as the detent selector for your gears.
mrsmallblock



Re: How to replace shift shaft seal on 727 trans? [Re: 1100HPSmallBlock] #29473
09/03/06 01:42 PM
09/03/06 01:42 PM
Joined: Sep 2004
Posts: 1,913
Brunswick, Jawgia
Snailpower Offline
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IMO, the deep pan is a band aid for a bad seal on the trans. Fix it right the first time. You can do this seal replacement without pulling the valve body, dropping the pan and if the trans is clean you won't even get your hands dirty (much).

Take the kickdown and selector lever off the trans (both pinch bolts) and take a sharp pick to work the selector shaft seal out of it's hole and up the shaft. It's a press fit, so jab the pick through the top of the old seal and use leverage.

Take the new seal, lube it a little and slide it over the shaft until it sits evenly on the trans case, not cocked. Take a deep socket the same size as the seal and slide it over the shaft to rest on top of the seal. Tap the socket until the top of the seal is flush with the trans case. Re-install selector/kickdown levers.

I have done many this way. The worst I have had to do is un-bolt the trans crossmember to drop the end of the trans down for a little more room to work.

Jeff


70 Coronet- turbocharged 360/518/3.73 SG
Re: How to replace shift shaft seal on 727 trans? [Re: Snailpower] #29474
09/03/06 02:25 PM
09/03/06 02:25 PM
Joined: Jan 2003
Posts: 25,618
Rio Linda, CA
John_Kunkel Online content
Too Many Posts
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Quote:

IMO, the deep pan is a band aid for a bad seal on the trans.




The deep pan won't have any affect on leakage since the FULL mark remains the same regardless of pan capacity.


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Re: How to replace shift shaft seal on 727 trans? [Re: John_Kunkel] #29475
09/03/06 04:53 PM
09/03/06 04:53 PM
Joined: Jan 2003
Posts: 616
Sacramento, CA
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Kirk_Ingram Offline
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Sacramento, CA
Quote:

Quote:

IMO, the deep pan is a band aid for a bad seal on the trans.




The deep pan won't have any affect on leakage since the FULL mark remains the same regardless of pan capacity.



And the "band-aid fix" is to fill the trans with a couple quarts less. And the fill mark is now a GUESS. That will be a PITA for the next owner(s).

I doubt the shaft seal in the VB is the issue (but it has happened). See attached for a visual. (note: snap ring and washer removed) {If you want/need this seal, I'll mail one to you; I have more than I'll ever use)

Just pull the pan, valvebody and fix it properly, as others have stated. No reason to spend more money on an extra-capacity pan when it's not necessary. -K

2894458-DSCN0117.JPG (2508 downloads)

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