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727 Trans sealent? #384074
07/23/09 10:39 AM
07/23/09 10:39 AM
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Posts: 353
Chesterfield, MIch
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Cuda67 Offline OP
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Chesterfield, MIch
Thanks for any help. I have 2 stamped oil pans. Both leak no matter what I do. Tried the rubber gasket and the good one that Mancini sells. Tried a few sealents and the trans fluid eventually attacks it after a day or so, and the leak is back. I suspected the filler tube, but one pan leaks only in the back. What can I use to fix this *(&*^%) leak.
Thanks

Re: 727 Trans sealent? [Re: Cuda67] #384075
07/23/09 10:40 AM
07/23/09 10:40 AM
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Grand Prairie,Texas
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Have you checked the pans to be sure they are flat and are you overtightening them. Did you try the MOPAR gasket that has three layers and the can't be over torqued? It had metal reinforcement at the bolt holes.

Re: 727 Trans sealent? [Re: Cuda67] #384076
07/23/09 10:48 AM
07/23/09 10:48 AM
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Chesterfield, MIch
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Cuda67 Offline OP
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Chesterfield, MIch
Thanks.
I'm sure neither pan is flat, or they would not leak. I have no good way of checking. So I'm hopeing to find something to seal them.

Re: 727 Trans sealent? [Re: Cuda67] #384077
07/23/09 11:13 AM
07/23/09 11:13 AM
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Baltimore, MD
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MadMax58 Offline
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Quote:

one pan leaks only in the back. What can I use to fix this *(&*^%) leak.
Thanks




Lay the pan on a flat surface check for gaps between the pan and the flat surface. If the pan is bent straighten it. Look for leaks from up above where the fluid would run down on the pan. Check the gear selector shaft seal, Fill tube o-ring, cooler lines. There is pin in the back of the transmission under the tail shaft which has a o-ring on it. Mine was leaking real bad from the pin. I pulled the pan, cleaned the area up, put a little rtv on top of the pin and let it dry before filling the trans with atf. No more leak from the pin.

Re: 727 Trans sealent? [Re: Cuda67] #384078
07/23/09 11:36 AM
07/23/09 11:36 AM
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Chesterfield, MIch
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Cuda67 Offline OP
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Chesterfield, MIch
I have replaced the O-ring on the fill tube. It the oil pan that leaks. One leaks in the front near the fill tube. I have checked the tube and that is not it. The other pan leaks in in the middle of the back of the pan. So it is 2 diffent spots depending on which pan I install.

Re: 727 Trans sealent? [Re: Cuda67] #384079
07/23/09 12:39 PM
07/23/09 12:39 PM
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Posts: 1,488
New Mexico
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74Scamp Offline
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New Mexico
You could hold the pan onto a glass window to check whether it's flat.

Re: 727 Trans sealent? [Re: 74Scamp] #384080
07/23/09 01:22 PM
07/23/09 01:22 PM
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Posts: 3,958
SW Fla.
CYACOP Offline
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Probably leaking from somewhere else other than the pan. DAMHIK

Re: 727 Trans sealent? [Re: CYACOP] #384081
07/23/09 01:27 PM
07/23/09 01:27 PM
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Southeast Pa.
SALEM1912 Offline
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Southeast Pa.
You could try the form gasket from mopar thats all we use now. BTW they are reuseable.

Re: 727 Trans sealent? [Re: SALEM1912] #384082
07/23/09 01:30 PM
07/23/09 01:30 PM
Joined: Jan 2003
Posts: 20,544
Eagle, Idaho
Neil Offline
The Doctor is in.
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Eagle, Idaho
Straighten the pan or buy a new one.

Re: 727 Trans sealent? [Re: CYACOP] #384083
07/23/09 01:38 PM
07/23/09 01:38 PM

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As a last resort, check the seal where the shift levers come though the case and go to the valvebody. Sometimes they leak there as well.

Permatex ultra-blue works well to seal but will be a #*$& to get off if you ever want to do maintenance.

Always make sure and re-torque the pan bolts after the transmission has cycled a few times as they will loosen up.

Re: 727 Trans sealent? #384084
07/23/09 03:36 PM
07/23/09 03:36 PM
Joined: May 2003
Posts: 15,487
Florida
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scratchnfotraction Offline
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what you looking for is all the above...AND the MOPAR black ATF RTV sealant from the dealer

its the trick to the tranny fluid not eating it,also opt for the new o-ring pan gasket from the dealer for about 12-15$$

take a wood handle and lay the pan on the edge of something solid tap the holes back down and straighten the pan rail from the tranny side

use a 1/4" drive to torque the bolts and dont over tightin them..thats why the pans all bent up

but around the bolt holes is first spot to straight out,IMO

also check the speedo gear plug

I clean the whole tranz with brake clean and air dry...throw a hand full of baby powder up around the gear select shaft seal and a round the dip tube..just cause you changed the o-ring does not mean its not bent as well...this is a very good spot for the mopar black atf rtv


check all other places it can leak first then the pan rail,IMO


Re: 727 Trans sealent? [Re: scratchnfotraction] #384085
07/23/09 03:50 PM
07/23/09 03:50 PM
Joined: Jul 2008
Posts: 30,424
Florida STAYcation
dOrk ! Offline
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Florida STAYcation
Wanna' be DONE with pan leaks forever ? ...

Get a cast alum pan and be done-with-it.

Re: 727 Trans sealent? [Re: dOrk !] #384086
07/23/09 06:12 PM
07/23/09 06:12 PM
Joined: Jan 2003
Posts: 4,616
Kissimmee Fl.
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dusturbd340W5 Offline
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get a good pan use the mopar gasket that is reusable and forget about all the RTV and sealers they have there place and on a trans is not one of them


70 duster full chassis super pro 416 CNC Indybrock heads 727 w/brake

best so far 1.212 60 6.219 in 1/8 at 110.88 9.768 at 137.81 1/4
Re: 727 Trans sealent? [Re: Cuda67] #384087
07/23/09 07:37 PM
07/23/09 07:37 PM
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Posts: 353
Chesterfield, MIch
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Cuda67 Offline OP
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First, thanks to everyone. I gave up and ordered a cast aluminum pan from Summit.

Re: 727 Trans sealent? [Re: Cuda67] #384088
07/23/09 07:38 PM
07/23/09 07:38 PM
Joined: Jan 2003
Posts: 32,929
Grand Prairie,Texas
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Grand Prairie,Texas
Now all you need is the GOOD gasket from Mopar.

Re: 727 Trans sealent? [Re: stumpy] #384089
07/23/09 08:42 PM
07/23/09 08:42 PM
Joined: Apr 2007
Posts: 2,327
Glendale, AZ
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69L78Nova Offline
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Ive only had luck with a cork gasket. Never had one so much as seep


1969 Nova
454/M21/3.31
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1994 F150 XLT Super Cab 2WD
5.0/4R70W/3.55
(Daily driver)
Re: 727 Trans sealent? [Re: 69L78Nova] #384090
07/23/09 09:16 PM
07/23/09 09:16 PM
Joined: Jan 2003
Posts: 32,929
Grand Prairie,Texas
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Quote:

Ive only had luck with a cork gasket. Never had one so much as seep



Have you tried the new mopar gasket? The way it's made makes it just about fool proof and it's reusable.







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