Help Replacing an Automatic Transmission Seal - Mustang Evolution

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Old 12-04-2013, 08:47 PM   #1
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Help Replacing an Automatic Transmission Seal

I just bought a 1990 4 cylinder automatic mustang, which my brother has been fixing up after the previous owner let it sit for about 5 years. After performing a heater core replacement with fear and trepidation, I though I was set to go, but then all the transmission fluid slowly leaked out during my commute.

I was able to buy a jug of fluid and limp home, and the local mechanic shop gave it a free inspection, and confirmed the leak was coming from the main seal. It's $26 for the seal and $500 for the tax and labor to have them replace it. I don't exactly have piles of cash laying around, so I'm probably going to end up undertaking this myself. Trouble is, I've never done this before.

Has anyone else replaced this seal, or at least dropped the automatic tranny, who would be willing to tell me how to go about it? I have a Haynes manual, but I'd prefer to have a human with some experience to run to when I get stuck.
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Old 12-05-2013, 12:15 PM   #2
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So it was the tail shaft seal? Just gotta drop the exhaust, and driveshaft to get to it.

---------- Post added at 02:15 PM ---------- Previous post was at 02:12 PM ----------

You shouldn't have to drop the tranny to replace it. Now if you mean the rear main seal on the engine, then yes, you would have to remove the AOD.
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Old 12-05-2013, 04:22 PM   #3
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I think it's the rear main seal. The guys at the shop estimated 4.5 hours of work, and said they'd have to drop the tranny to get at it. So, yeah, looks like I'm dropping the AOD.
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Old 12-05-2013, 04:43 PM   #4
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It can be done in a drive way, but you'll need a buddy. Its very heavy and saftey first!

---------- Post added at 06:43 PM ---------- Previous post was at 06:41 PM ----------

Basically support the tranny, and take out the bellhousing bolts and tranny cross member. Then it should "wiggle" off. But again, its heavy. You could try and drain it first to make it alittle lighter.
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Old 12-05-2013, 04:50 PM   #5
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Edit: oh forget mention disconnecting the trans cooler lines too. You also need to take the flywheel off too....
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Old 12-05-2013, 05:24 PM   #6
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Many Thanks!
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Old 12-05-2013, 06:03 PM   #7
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Any special tools I'm gonna need to buy, above and beyond the basic socket set, jack, and stands?
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Old 12-05-2013, 06:18 PM   #8
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There shouldn't be any special tools needed just your basic tools will work fine. How ever you will need a 12 point 12 MM wrench to remove the nuts on the u-joints.
When it comes to removing the rear main a self tapping screw screwed into the center of the rear main will help you get the rear main out, otherwise you will need a special tool to remove the rear main.
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Old 12-05-2013, 09:50 PM   #9
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Ahh, thank you very much!
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