A-727 help
#2376933
09/26/17 01:51 AM
09/26/17 01:51 AM
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Joined: Mar 2005
Posts: 386 Maryland
reno340
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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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Re: A-727 help
[Re: Dave Hall]
#2376949
09/26/17 03:20 AM
09/26/17 03:20 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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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.
live every 24 hour block of time like it's your last day on earth
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Re: A-727 help
[Re: Dave Hall]
#2377103
09/26/17 12:43 PM
09/26/17 12:43 PM
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Joined: Jan 2003
Posts: 75,095 A Banana Republic near you.
JohnRR
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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.
running up my post count some more .
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Re: A-727 help
[Re: reno340]
#2377318
09/26/17 08:24 PM
09/26/17 08:24 PM
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Joined: Jan 2003
Posts: 25,995 Rio Linda, CA
John_Kunkel
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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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Re: A-727 help
[Re: reno340]
#2377369
09/26/17 09:50 PM
09/26/17 09:50 PM
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Joined: Mar 2005
Posts: 386 Maryland
reno340
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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?
Last edited by reno340; 09/27/17 12:00 AM.
"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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Re: A-727 help
[Re: John_Kunkel]
#2377451
09/26/17 11:36 PM
09/26/17 11:36 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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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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Re: A-727 help
[Re: John_Kunkel]
#2377468
09/26/17 11:54 PM
09/26/17 11:54 PM
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Joined: Nov 2011
Posts: 653 montana
pjc360
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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.
Last edited by pjc360; 09/26/17 11:55 PM.
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Re: A-727 help
[Re: reno340]
#2377531
09/27/17 02:56 AM
09/27/17 02:56 AM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
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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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Re: A-727 help
[Re: reno340]
#2377666
09/27/17 12:36 PM
09/27/17 12:36 PM
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Joined: Jan 2003
Posts: 75,095 A Banana Republic near you.
JohnRR
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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 ?
running up my post count some more .
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Re: A-727 help
[Re: JohnRR]
#2378012
09/27/17 11:23 PM
09/27/17 11:23 PM
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Joined: Mar 2005
Posts: 386 Maryland
reno340
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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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Re: A-727 help
[Re: John_Kunkel]
#2378025
09/27/17 11:34 PM
09/27/17 11:34 PM
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Joined: Mar 2005
Posts: 386 Maryland
reno340
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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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Re: A-727 help
[Re: reno340]
#2378115
09/28/17 02:13 AM
09/28/17 02:13 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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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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