Transmission housing gasket leaking?

Tiny
EZEX
  • MEMBER
  • 2012 KIA SEDONA
  • 3.5L
  • V6
  • 2WD
  • AUTOMATIC
  • 135,000 MILES
I have a ATF leak. The front of the transmission housing is all corroded and leaking. I first thought it was an oil leak when I kept noticing a leak beneath the car in the morning. Transmission itself feels perfectly fine. Is that something I can repair myself on jack stands or does the transmission need to be dropped? It's a sealed transmission so I can't even tell how much fluid I lost. The transmission fluid is the original 135, 00 mile fluid.
Thursday, September 19th, 2024 AT 1:17 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
Hi,

That appears to be the transmission valve body cover/pan. The gasket needs to be replaced. Yes, you can do this without removing the transmission.

If you look below, I attached directions for replacing transmission switches because there are no directions only for the gasket. You will be removing the cover, cleaning things up and inspecting surfaces, and then reinstalling the cover with a new gasket.

And the fluid level will need to be checked after doing this. It can be done. The remaining directions explain the (crazy) procedure for filling and checking the level. The vehicle needs to be level when doing this, so without a lift it may be somewhat difficult.

Let me know if this helps or if you have other questions.

Take care,

joe

See pics below. Note, when checking the level, the vehicle must be flat, running, and the transmission at operating temperature.
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Thursday, September 19th, 2024 AT 7:31 PM
Tiny
EZEX
  • MEMBER
  • 49 POSTS
What cleaning things up? And I'm assuming replace the valve cover along with the gasket? That cover looks damaged. Any idea what the part numbers for the eye bolt gaskets are? How can I check the transmission temperature?
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Monday, September 23rd, 2024 AT 9:18 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,645 POSTS
Hi,

As far as the part numbers for the I-bolts are concerned, they aren't listed in my manual. As far as the temp, without a scanner, the easiest thing to do would be to use an infrared thermometer. If you don't have one, often a parts store will lend one to you.

The cover itself should be okay. However, if you find it to be damaged, yes, it should be replaced.

I'm not sure what you are referring to when you said, "What cleaning things up?" Please explain.

Joe
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Tuesday, September 24th, 2024 AT 6:34 PM

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