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Old 09-08-2010, 07:28 PM
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700R4 leak - see photo

Hi -
Have a 700R4 transmission that's leaking. See picture for where it's leaking (on my computer it's not showing up but does if I click on it). Was hoping someone could help me with what this is and how difficult or easy it is to fix. I can do some basics and was ready to remove the pan and replace the gasket, but upon looking closer I could see that wasn't the problem (for now). Looks like there's a sender unit going in there, and the seal is bad? How do you take out the sender, is there a part number for the gasket/seal, etc. How easy is it to break the sender unit (assuming that's what it is)?

Also, it only leaks when not running, which seems expected as the fluid level wouldn't be that high when running. But the weird thing is, upon turning the car off, it will leak a few drops a day (literally) for a few days and then after a few days it will start leaking significantly more than that (maybe a few drops every few hours). Seems like that's a long time for the fluid to drain all back into the pan. Thoughts?
Thank you!
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Last edited by loafing1; 09-08-2010 at 07:36 PM.
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Old 09-08-2010, 07:55 PM
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That is the Electrical connector for the TCC/TorqueConverterClutch. There is an O-ring you can replace. I'm not sure if you have to drop the pan to remove it. Someone will know.

Looking at the locking clips you may have to remove pan>> http://www.makcotransmissionparts.com/74444A.html
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Old 09-08-2010, 08:19 PM
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It probably does have an "o" ring leak or it is leaking through the plastic cap at the wires. After you fix it make sure that the linkage is not bumping up against it. From the picture it looks like it could be doing just that. It may have joggled it enough to where it started leaking.
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Old 09-08-2010, 08:43 PM
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Good thought on the linkage. I'll need to have someone shift it when I can watch it in-action, but in shifting and then looking, it's got a couple mm clearance in p-r-n (before it moves above altogether) and doesn't seem to hit the connector if I joggle it.

Anyone ever try Permatex flexible sealants or gasketing as a short-cut quick fix?
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Old 09-08-2010, 08:49 PM
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You colud try blasting it with Brake Clean and glob RTV on it. May work.
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Old 09-10-2010, 04:23 PM
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You should be able to get to the connector to unplug the wiring part that connects to the plastic part you see protruding through the case, then push it out to replace it. It is really not very difficult.

If you take a deep well thin walled 11/16 12-point socket you can fit it over the contacts so you can push them all in and safely push the connector out from the inside of the case. Then it is as easy as putting the new O-ring on the connector, pushing it back into the case and reconnecting the electrical connector.

Here is a pic of what it looks like from the inside of the case.

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