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Old 07-07-2008, 10:39 AM   #1 (permalink)
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Upgrading an AOD?

Hi Guys,

I've built a healthy 347 stroker that I hope to install in my '67 Mustang this winter. To handle the extra HP, I've recently rebuild and upgraded a '74 C4 that should easily handle 450HP (thanks to all the info available in this forum, and Gregaust in particular).
Since then I've picked up an AOD transmission from a '84 5.0 Thunderbird. Because of the overdrive, I'd like to use the AOD in my fastback. I'm wondering what it will take to upgrade the AOD to comfortably handle 450HP (street driving only), if it's even worthwhile.

For what it's worth, the AOD's tag reads;
PKA K8
055454 A16
E4SP DA

I'm assuming the E4 confirmes it actually is an '84 trans?
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Old 07-07-2008, 12:38 PM   #2 (permalink)
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Re: Upgrading an AOD?

You'll need to have it built to handle that. Lentech automatics is the way to go IMO for an AOD. You can by his parts and have a local guy you trust put it together
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Old 07-07-2008, 01:06 PM   #3 (permalink)
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Re: Upgrading an AOD?

I have been there with an AOD. You need one from an 1988 or later model. The early case is not set up to handle it. The later case and innards are much improved. Much improved oiling.
Save some grief and dump what you have and look for something '88 and up.


Good luck on the project!
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Old 07-08-2008, 08:12 AM   #4 (permalink)
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Re: Upgrading an AOD?

Thanks guys, that confirms pretty much what I suspected. I guess I'll be using the C4 I did up earlier.
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Old 07-08-2008, 09:35 AM   #5 (permalink)
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Re: Upgrading an AOD?

Quote:
Originally Posted by ranchero67 View Post
I have been there with an AOD. You need one from an 1988 or later model. The early case is not set up to handle it. The later case and innards are much improved. Much improved oiling.
Save some grief and dump what you have and look for something '88 and up.
You can get 90's model AOD cores all day long for next to nothing and have it built. You can get the AOD conversion kits for your mustang from pretty much every classic Mustang parts supplier.
Learn from my mistake... Get a high-quality kit and have it built and set up locally. I got burned on one of those "Ebay specials" from Transmission Depot in FL. My so-called 600 HP Demon AOD had to be completely rebuilt inside of a year and amounted to not much more than a stock AOD with a shift kit.
A great source for parts and info is Jay at Broader Performance. He has good prices on high performance AOD parts and custom valve bodies and is great to deal with. You could easily put together an AOD to handle 450HP. My AOD works great now. It acts like a C4 in 1st - 3rd but then I have a 4th gear for highway cruising. That 4th gear is also very nice driving around town so it's worth considering!
AOD transmissions
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Old 07-08-2008, 11:11 PM   #6 (permalink)
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Re: Upgrading an AOD?

Yep, Broader performance has an excellent AOD for street and strip for $1600. It is made to stand up to 400 - 450 HP. They also sell a C4 to handle the same HP for $800. AODs are expensive transmissions because they require so much work to take the HP. Basically anything after 1985 before 1993 has to have hard parts changed out to make it work with that much HP. Even if you start with a 1993 AOD you have to modify or replace the hardened shafts, lubrication and cooling ports in them. There are about 27 mods that are made to the valve body and some machine work to the pump, stator and case.
This is not anything like the C4. You also need special tooling to set end-play, replace bushings and check clearance for the intermediate clutch. Unless you are going to build more than one it just isn't worth the cost of tooling for the average guy doing a rebuild in his garage.
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