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#2376933 - 09/25/17 11:51 PM A-727 help
reno340 Offline


Registered: 03/26/05
Posts: 386
Loc: Maryland
Ok, I am getting frustrated. I have been dealing with the same trouble with this transmission since day 1. It keeps leaking out of the front pump or something in behind the torque converter. I have rebuilt the transmission, put in a new torque converter, new front pump bushing and seals and I got a leak again. I had pulled the motor to rebuild it, and while it was out got another torque converter, (for more performance since I built the engine) and had a tranny shop put in another new seal and bushing in the pump. so I thought I had it fixed but I was only taking short trips across town in it. I have been driving it for a little while and thought all was welll with it. Today I took it up the highway and smoke poured out from under the car and I noticed when I drove it by a buddies house, I was leaving a trail of tranny fluid. I looked and sure enough, it is dripping out of the front again. Another complaint is that I have had to run the car in neutral to pump fluid to get the car to back out of the garage. I only have to do it once that day. Does anyone know what is happening?
I really need help here.
_________________________
"There are only three real sports, Mountain climbing, Bull Fighting and Auto Racing. The rest are just games"
- Earnest Hemmingway


If you can't run with the big dogs, stay on the porch!!

https://www.youtube.com/watch?v=_xQJtN1_6DU

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#2376937 - 09/26/17 12:11 AM Re: A-727 help [Re: reno340]
B5 Bee Offline
master

Registered: 02/28/03
Posts: 8020
Loc: Pangaea
A leaky shift shaft seal is very common. I've had to change several over the years. There is a tool to change it without dropping the pan. It may not be your problem since the leaky shift shaft seals I've had only leak when the car has sat unused for a period of time.

The O-ring on the dipstick tube is a possibility and easy to change. I'd check that first.

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#2376944 - 09/26/17 12:50 AM Re: A-727 help [Re: reno340]
Dave Hall Offline
top fuel

Registered: 01/21/08
Posts: 2010
Loc: Cotati, CA
Pretty common on the neutral thing. They don't pump fluid in park. I'm dealing with the same leak from the front seal right now so please post back what you find out. What happens on mine is that it drips and fills up the bell area and when I hit the brakes it dumps and gets on the exhaust.

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#2376949 - 09/26/17 01:20 AM Re: A-727 help [Re: Dave Hall]
RapidRobert Offline
Circle Track

Registered: 11/20/03
Posts: 34413
Loc: Lincoln Nebraska
my front pump seal has a minor leak also & I took care on installing the new seal when I put this (727) trans in. I may have distorted it a bit tho I was careful just because of this exact potential. I packed the garter spring with vaseline all to no avail. my next one I might have to locate the seal driver that goes into the seal ID then you drive it in.
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live every 24 hour block of time like it's your last day on earth

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#2377005 - 09/26/17 08:37 AM Re: A-727 help [Re: reno340]
Motor Mayhem Offline
member

Registered: 09/25/17
Posts: 7
Loc: Idaho
One thing to check for is a restricted oil cooler circuit. This can cause fluid to be forced out of the vent.

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#2377037 - 09/26/17 09:38 AM Re: A-727 help [Re: reno340]
451Mopar Offline
master

Registered: 05/19/08
Posts: 5038
Loc: Aurora, Colorado
re-locate vent to rear of transmission.
Check dip-stick tube. I had one that was cracked where the "O"-ring fits.
Sonnax lube regulated pressure regulator valve.
http://www.sonnax.com/parts/1842-lube-regulated-pressure-regulator-valve

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#2377092 - 09/26/17 10:31 AM Re: A-727 help [Re: reno340]
469runner Offline
super stock

Registered: 01/07/04
Posts: 1092
Loc: North Carolina
Front pump retaining bolt washers. Front pump seal. Converter hub seal. Vent. Dipstick tube. These are all areas that can leak out of the front.

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#2377103 - 09/26/17 10:43 AM Re: A-727 help [Re: Dave Hall]
JohnRR Offline
I Win

Registered: 01/20/03
Posts: 73560
Loc: U.S.S.A.
Originally Posted By Dave Hall
Pretty common on the neutral thing. They don't pump fluid in park.


Incorrect, it pumps fluid in park just not at the rate it does in neutral or in gears.

Transgo has a replacement manual valve, it's included with their shift kits, that allows more fluid flow in park.

There are more things than the seal that can leak up front. Every bolt has a seal washer under it, a lot of times they do not get replaced. The square cut o ring around the outside of the the pump body can also be a leak point, especially if the surface it seals against is damaged or it gets damaged on install. Same goes for the bore the seal is installed in.
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#2377318 - 09/26/17 06:24 PM Re: A-727 help [Re: reno340]
John_Kunkel Offline
I Live Here

Registered: 01/20/03
Posts: 19833
Loc: Rio Linda, CA

Be sure the dipstick is reading correctly and you're not overfilling it. The FULL mark on the dipstick should be about 1/4" above the ledge where the dipstick tube enters the case.
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I'm supposed to respect my elders, but its getting harder and harder for me to find one now.

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#2377369 - 09/26/17 07:50 PM Re: A-727 help [Re: reno340]
reno340 Offline


Registered: 03/26/05
Posts: 386
Loc: Maryland
the thing that seems to jump out at me is the idea of fluid going out the vent tube. It only really did this when I ran it up the highway. I had been driving it on the streets and secondary roads for about a month and it really didn't leak this badly. I did put in a new filler tube that had a locking dipstick that had a different type of grommet type of seal instead of the O-ring. The gaskets and the O ring around the pump are new and carefully put in. I had a tranny shop install the bushing and shaft seal for the Transmission pump. seems like the higher RPM's made the fluid come out. (3.55's with 14 inch tires at 70 MPH) Relocating the vent?
How do I do that? Can it be done with the transmission in the car? Ughhhhh!! I'm getting tired of pulling out this transmission.

451 Mopar
So, is the Sonex lube pressure valve the fix for the leak or for the drainback?


Edited by reno340 (09/26/17 10:00 PM)
_________________________
"There are only three real sports, Mountain climbing, Bull Fighting and Auto Racing. The rest are just games"
- Earnest Hemmingway


If you can't run with the big dogs, stay on the porch!!

https://www.youtube.com/watch?v=_xQJtN1_6DU

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#2377451 - 09/26/17 09:36 PM Re: A-727 help [Re: John_Kunkel]
RapidRobert Offline
Circle Track

Registered: 11/20/03
Posts: 34413
Loc: Lincoln Nebraska
Originally Posted By John_Kunkel

Be sure the dipstick is reading correctly and you're not overfilling it. The FULL mark on the dipstick should be about 1/4" above the ledge where the dipstick tube enters the case.
John does that apply the same on a 904?
_________________________
live every 24 hour block of time like it's your last day on earth

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#2377468 - 09/26/17 09:54 PM Re: A-727 help [Re: John_Kunkel]
pjc360 Offline
mopar

Registered: 11/23/11
Posts: 653
Loc: montana
Originally Posted By John_Kunkel

Be sure the dipstick is reading correctly and you're not overfilling it. The FULL mark on the dipstick should be about 1/4" above the ledge where the dipstick tube enters the case.


I agree with john, few years back I had a transmission shop re-build the A-518 that's in my 91 short bed 4x4 dodge truck and they decided to give me a new dip stick tube that went behind the engine instead of to the side how they normally did them.
I had the same issue, tranny fluid pouring out of the front, took the truck back cause it was under warranty.
The owner him self got involved and pulled the transmission and I called him and he said i tore the entire thing down and I have no idea why it was leaking everything is solid, and that night while he was laying in bed he remembered the dip stick tube they had swapped inn and bells went off and sure enough they had over filled it by about 2-3 qts and every time I would hit the highway it would come out.
So make sure your dip stick level is right before tearing it back out.


Edited by pjc360 (09/26/17 09:55 PM)

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#2377495 - 09/26/17 10:44 PM Re: A-727 help [Re: reno340]
Motor Mayhem Offline
member

Registered: 09/25/17
Posts: 7
Loc: Idaho
Check the cooler and lines. When I built the 440 for my coronet, I had the car parked in the lot at work with the radiator out and the lines propped up to keep them from leaking. After installing the engine, all seemed fine until the first time I took it up to highway speed. It then puked at least a quart out of the vent. After verifying the fluid level (I had installed a new tube and locking stick), I finally decided to flush the lines and cooler. Found the lines plugged with small insects called cutter bees that had climbed into the lines while the motor was out. Blew out the bugs and all was well.

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#2377522 - 09/26/17 11:58 PM Re: A-727 help [Re: reno340]
RTSrunner Offline
pro stock

Registered: 11/03/03
Posts: 1406
Loc: Pittsburgh,PA
I agree with the dipstick check as the first opion.New parts,double check fit.On another idea,is it possible there is a crack in the case or the pump?
RT

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#2377531 - 09/27/17 12:56 AM Re: A-727 help [Re: reno340]
451Mopar Offline
master

Registered: 05/19/08
Posts: 5038
Loc: Aurora, Colorado
I just found out that Sonnex has the pressure valve for the older transmissions. I thought it was only for the newer transmissions.
I haven't used the valve yet, but I like the design. It is to allow the fluid flow to cooler when in park, without the drain-back issue of just drilling the valve body.

I have been using the Trans-Go TF-2 shift kits, with their manual valve which seems to work good too.

When I re-located my vent, I drilled the main case when it was out of the car, but you could do the tail shaft extension too.
A Pneumatic 1/8" NPT to 1/4" push to connect tube connector, and some 1/4" Nylon Pneumatic tubing run to a higher location like the firewall worked good for me

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#2377666 - 09/27/17 10:36 AM Re: A-727 help [Re: reno340]
JohnRR Offline
I Win

Registered: 01/20/03
Posts: 73560
Loc: U.S.S.A.
You are going to have to pull the trans to relocate the vent, part of relocating the vent is the block the one in the pump housing, you can't do that with it in the car.

Did you do anything to modify the the front drum so it expels more fluid when venting? Is the plastic baffle for the vent cover intact inside the trans ? stock drum or a billet drum with a larger piston that requires the vent to be modified ?
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#2378012 - 09/27/17 09:23 PM Re: A-727 help [Re: JohnRR]
reno340 Offline


Registered: 03/26/05
Posts: 386
Loc: Maryland
Originally Posted By JohnRR
You are going to have to pull the trans to relocate the vent, part of relocating the vent is the block the one in the pump housing, you can't do that with it in the car.

Did you do anything to modify the the front drum so it expels more fluid when venting? Is the plastic baffle for the vent cover intact inside the trans ? stock drum or a billet drum with a larger piston that requires the vent to be modified ?


I did put in a front drum from a diesel ram but it was early enough that it fit. The valve body was also changed to a Chetah forward pattern manual valve body. I have a 2400 stall converter in it too but if pretty much feels little to no different than the old one.
_________________________
"There are only three real sports, Mountain climbing, Bull Fighting and Auto Racing. The rest are just games"
- Earnest Hemmingway


If you can't run with the big dogs, stay on the porch!!

https://www.youtube.com/watch?v=_xQJtN1_6DU

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#2378025 - 09/27/17 09:34 PM Re: A-727 help [Re: John_Kunkel]
reno340 Offline


Registered: 03/26/05
Posts: 386
Loc: Maryland
Originally Posted By John_Kunkel

Be sure the dipstick is reading correctly and you're not overfilling it. The FULL mark on the dipstick should be about 1/4" above the ledge where the dipstick tube enters the case.
Is there a way that I can Measure this without pulling the dipstick tube? I hate to have to lose all of that fluid. (I have a deep aluminium pan) The dipstick and tube are an Allstar Performance 69120 dipstick and tube.
_________________________
"There are only three real sports, Mountain climbing, Bull Fighting and Auto Racing. The rest are just games"
- Earnest Hemmingway


If you can't run with the big dogs, stay on the porch!!

https://www.youtube.com/watch?v=_xQJtN1_6DU

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#2378115 - 09/28/17 12:13 AM Re: A-727 help [Re: reno340]
RapidRobert Offline
Circle Track

Registered: 11/20/03
Posts: 34413
Loc: Lincoln Nebraska
if you had another tube layeing around you could check it that way (assuming they are both dead on identical) which I would think they would be.
_________________________
live every 24 hour block of time like it's your last day on earth

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#2378195 - 09/28/17 09:43 AM Re: A-727 help [Re: reno340]
Transman Online   content
super stock

Registered: 03/27/11
Posts: 902
Loc: Michigan
Measure the outside of the tube from the top to the top of the trans case next to he tube entry point - following the contour of the tube. Then measure the stick from the bottom of the dipstick cap that rests on the tube down the same distance you got from the first measurement. Mark the stick there.

Then warm the trans up, run it through R, low then back to N then check the fluid level.

If above the new mark drain until on the new mark you made. That should get you very close.

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