Author Topic: Transmission fluid leak  (Read 6960 times)

torres78

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Transmission fluid leak
« on: March 21, 2010, 12:06:19 PM »
I am having transmission fluid problems, I have fluid dripping from around the pan, whe chage the gasket because it was in bad shape, the line from the radiator to the transmission does not apear to be damage so I know that there is no problem there.
Has anybody had this problem before and so which other areas should I look for.
Normally the dripping is worst after taking the care for a drive, and also drips when the car is seating without been use.

66GTKFB

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Re: Transmission fluid leak
« Reply #1 on: March 21, 2010, 01:54:28 PM »
It would help if you told us the year and engine type.
Jim

Soaring

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Re: Transmission fluid leak
« Reply #2 on: March 21, 2010, 02:27:43 PM »
Fill out your bio so we know which transmission you are talking about.  It could be an automatic or a manual transmission.  It could be anywhere from a C-4 to a T-5. 

torres78

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Re: Transmission fluid leak
« Reply #3 on: March 21, 2010, 07:40:13 PM »
I am sorry, I have a 68, 302 with a C4 automatic

Soaring

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Re: Transmission fluid leak
« Reply #4 on: March 21, 2010, 07:57:32 PM »
Is the leak coming from the rear seal?  I've heard of people taking the spring out of the oil seal and "twisting" in a few more turns to make the spring diameter smaller then putting the spring back into the seal. This puts a little more pressure around the seal.
Who knows it might help, it's a free fix.
And fwiw - swapping a yoke and a seal is not a big job. Tranny needs to be drained though, maybe raise the rear end of the car just a bit to keep whats left of the tranny fluid from leaking out when you pull the seal.
Remove the drive shaft with the yoke intact.



torres78

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Re: Transmission fluid leak
« Reply #5 on: March 21, 2010, 08:24:10 PM »
Thanks I will try that, it seems that the fluid drips around the bolts and towards the front of the panfrom what I saw

66GTKFB

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Re: Transmission fluid leak
« Reply #6 on: March 21, 2010, 09:32:25 PM »
Over time, the area around the bolt holes gets dimpled and the gasket cannot seal. You get a small leak and tightening the bolts only makes it worse. It's common and easy to fix. You need to remove the pan and flatten the mounting surface. Place the pan's mounting surface on a steel flat surface and use a steel bar and a hammer to make it flat. You may have to turn the pan over to do this but the "lip" will cause some grief. Just make it work. Do not use more than one gasket.
Jim

Soaring

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Re: Transmission fluid leak
« Reply #7 on: March 21, 2010, 09:53:27 PM »
If that's the case, then Jim is right.  The pan needs flattening or needs to be replaced.   

Jeff1967

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Re: Transmission fluid leak
« Reply #8 on: March 23, 2010, 09:35:11 PM »
I have been there done that, My 67' C4 had leaks that took some time to figure out where the fluid was coming from. Are you sure the leak is coming from the gasket or above somewhere? My car had leaks coming from the main shift shaft and from where the dip stick tube enters the transmission which is easily fixed by replacing the O ring. I recommend wiping the areas clean and when the dips start to appear feel around above the pan on the transmission casting to make sure it is not coming from above and running down off the pan. Take a strong flashlight and look carefully and you could as I did see where the fluid was actually running down and gathering around the pan and gasket joint area, appearing to be coming out from between when it was not.
 You might find your gasket is fine and there are other areas to concentrate your efforts on.

Jeff

 

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