Home » Public Forums » GMCnet » Transmission leak (Leak)
| Transmission leak [message #338956] |
Thu, 22 November 2018 06:38  |
Bierman
Messages: 46
Registered: May 2017
Location: SW Florida
Karma: 0
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Is anyone else out there having a transmission leak problem all the time??? It seems my transmission continually leaks SINCE an engine rebuild this past June.. Sirum GMC has had my GMC in 3/4 times for this, replaced o rings, new filler tube and bracket, changed fluid/ gasket, replaced pan, done little tricks they say would help...
After engine rebuild , the coach sat for 8 weeks...First time trying to take her out after sitting it would not drive but would go into reverse and drive...Come to find I had a mess under coach, it took 4 1/2 qts of tranny fluid..
Is the problem with the torque convertor? 4 1/2 qts...that seems excessive.
My driveway is a mess... Now after a trip I put cardboard underneath..within 4 days a 6 to 8 inch BLOT of transmission fluid on cardboard.
Need some help here..THANK YOU AND HAPPY THANKSGIVING
Member, GMCI, Sunshine Statesman and Dixielanders
26' 1978 Eleganza II, new(rebuilt by Sirum) 403, Lenzi hubs and knuckles, front end by Ferrara
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| Re: Transmission leak [message #338967 is a reply to message #338956] |
Thu, 22 November 2018 10:32  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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have a look at the modulator and make sure it has the correct O-ring fitted. Jack the coach and crib it safely, then proceed underneath with a roll of paper towels. Wipe the pan and edge of the castings clean and then return every few hours looking for trans fluid. A leak at the modulator will run down the edge of the pan and appear on the head of all the pan bolts in the back passenger side of the trans. Tuck a piece of clean paper towel under the modulator and above the pan lip. If it turns oily red that's where your leak is - either the modulator or the chain cover. A leaking chain cover gasket normally requires removal of the transmission to replace... but they aren't usually leak sources. Look at the modulator, the fill/dipstick tube and the pan itself.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: Transmission leak [message #338982 is a reply to message #338956] |
Thu, 22 November 2018 19:14 |
bobby5832708
Messages: 237
Registered: November 2006
Location: Winter Springs FL
Karma: 3
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In the mid 70's my first car, a '65 Mustang, needed an engine replacement due to the idiot owner (me) not checking to see if the cooling system had the proper concentration of antifreeze. It froze up and cracked the block. A couple of days after installing another 289 the transmission would dump a substantial quantity of fluid onto the driveway when the car was parked. Overnight wasn't too bad but when left for a few days I would need about a quart to make it drive again.
Since I had a part time job at a gas station and using their lift, removing the C4 trans was pretty easy. I replaced the front pump seal, reinstalled the trans, and the leak was fixed. I had the car a few months after that, rust eventually did it in (like most every other older car in New Jersey at the time).
My guess was that moving the torque converter back and forth just that little bit when replacing the engine buggered up the old front seal and caused it to leak. If I were to do it all over again I would have replaced the trans front seal while the engine was out. It's not the cost of the seal, it's the cost of labor if I was to pay someone (I've always done all my own repair work so the labor has been free). That's also why I love the GMC, I can work on it.
I'm not saying that this is the problem you are having with your GMC, maybe it is and maybe it isn't. This is just what happened to me.
Bob Heller
2017 Winnebago 29VE
Winter Springs FL
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| Re: Transmission leak [message #338991 is a reply to message #338956] |
Fri, 23 November 2018 05:48 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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I am not sure what sirum did, or how well he did the work.
These old transmissions can have interal parts wearing and that can put fluid/pressure where it does not belong.
The main leak points are the dip stick tube(easy). Modulator(easy). Take pan gasket down to seal that along with the orings on kickdown and shifter shaft.
If it is not those item, you will
Most probably need a rebuild.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: [GMCnet] Transmission leak [message #338993 is a reply to message #338991] |
Fri, 23 November 2018 11:06 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Rebuilding a transmission does not assure no leak.
A person that is familier with these old units and have been working around
will know where the leaks are coming from.
I can tell you where those places are as I use to crawell around these old
units.
Majority of trans shops are not aware and replace only the parts that come
in the Kit.
I know that Jeff Sirum knows and he convays that to his techs. We do the
same, but there is so much one can do to avoid leaks.
On Fri, Nov 23, 2018 at 3:48 AM Jon Roche wrote:
> I am not sure what sirum did, or how well he did the work.
>
> These old transmissions can have interal parts wearing and that can put
> fluid/pressure where it does not belong.
>
> The main leak points are the dip stick tube(easy). Modulator(easy). Take
> pan gasket down to seal that along with the orings on kickdown and shifter
> shaft.
>
> If it is not those item, you will
> Most probably need a rebuild.
>
>
> --
> Jon Roche
> 75 palm beach
> St. Cloud, MN
> http://lqqkatjon.blogspot.com/
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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>
--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Transmission leak [message #339000 is a reply to message #338993] |
Fri, 23 November 2018 15:29 |
Bierman
Messages: 46
Registered: May 2017
Location: SW Florida
Karma: 0
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Thanks for all the input. Going to start with Johmmys suggestion , but would also like to know what/where all those places jimk is talking about......defiantly will help and save some time in looking .
Also jim says there is so much one can do to avoid leaks... I am in Jim what are they? I am so tired of how my driveway looks so you help and information is appreciated.
Member, GMCI, Sunshine Statesman and Dixielanders
26' 1978 Eleganza II, new(rebuilt by Sirum) 403, Lenzi hubs and knuckles, front end by Ferrara
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| Re: Transmission leak [message #339007 is a reply to message #338956] |
Fri, 23 November 2018 18:54 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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I dont care if it is engine, tranny or interior. I can agree with Jim on the need of someone that knows.
https://youtu.be/T3DAPmb0UnU
Video of my th425 that drove just fine. But obviosly was going to have some issues. And leaked.
I know of 4 transmissions that had the same issue. Drove fine, but leaked because of this bearing/input shaft issue. One of those 4, he had spent a whole summer trying to figure out why it leaked. It only have him problems on long hot runs. Never leaked around town.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: [GMCnet] Transmission leak [message #339009 is a reply to message #339007] |
Fri, 23 November 2018 19:19 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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In 2000, returning from Alaska, the GMC developed a terrible ATF leak 6
miles west of Sheridan, WY. Eventually, I wound up in touch with Darrel
Winterfeld in Longmont, CO. After I arranged a tow from Cheyenne to his
shop (his home driveway), he told me to pick up an input shaft seal ($5.28)
since that "had" to be the problem.
After he dropped the transmission and pulled the seal, he said it looked
OK. So I hit the output shaft of the torque converter with a mallet -- a
ring of ATF appeared ALL THE WAY around where that shaft was welded into
the torus! Only the jagged edges of the crack meshing together enabled the
coach to move while trailing a cloud of red mist.
A new torque converter and that new seal got us back on the road with no
more problems.
Darrel said if he'd had decent help (me) it would have taken less than
those 5 hours to do the job. :-)
Not a frequent failure, but it can happen!
Ken H.
On Fri, Nov 23, 2018 at 7:54 PM Jon Roche wrote:
> I dont care if it is engine, tranny or interior. I can agree with Jim
> on the need of someone that knows.
>
> https://youtu.be/T3DAPmb0UnU
>
> Video of my th425 that drove just fine. But obviosly was going to have
> some issues. And leaked.
>
> I know of 4 transmissions that had the same issue. Drove fine, but leaked
> because of this bearing/input shaft issue. One of those 4, he had spent a
> whole summer trying to figure out why it leaked. It only have him
> problems on long hot runs. Never leaked around town.
>
>
>
>
> --
> Jon Roche
> 75 palm beach
> St. Cloud, MN
> http://lqqkatjon.blogspot.com/
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Transmission leak [message #339023 is a reply to message #338993] |
Sat, 24 November 2018 17:28 |
Bierman
Messages: 46
Registered: May 2017
Location: SW Florida
Karma: 0
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Hey Jim K, still waiting for those answers there bud. I know with all your knowledge you can share some of it which will save me some time plus looking forward to know what one can do to avoid these leaks.
Thanks
Member, GMCI, Sunshine Statesman and Dixielanders
26' 1978 Eleganza II, new(rebuilt by Sirum) 403, Lenzi hubs and knuckles, front end by Ferrara
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