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Old 02-23-2003, 01:57 PM
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Post Mustang auto trans question

I've got a '66 Mustang that had the transmission replaced once, and whatever it was it came out of a '67 something. Its bolted in behind a 289 currently, is a 3 speed. Anyone have any idea what model this might be or know where I could look on the trans to find out?

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Old 02-23-2003, 02:32 PM
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your car should have a C-4 tranny.

the pan is about 8.5 x 10 inches with 11 bolts.

A 4 bolt steel servo cover on the side of the tranny case on the drivers side.

A 4 bolt aluminum servo cover on the passenger side.
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Old 02-23-2003, 02:50 PM
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Thanks!

Assuming I have a C4, should I go ahead and rebuild it (am doing a 289 to 302 swap, a bit beefier than stock, but still able to use a stock converter) or look for something else? I'd like to get something in it that will keep the RPMs down on the freeway... maybe an AOD?

Anyone have any suggestions?
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Old 02-23-2003, 03:05 PM
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if you're not going to use an aod, the optimum gears for highway use would be 2.80s. I had them in my mustang for a while and with 25inch tall tires, i was doin 2500rpm at 65mph. Of course you will loose acceleration with these gears.
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Old 02-23-2003, 04:45 PM
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Any idea where I can get info on putting an AOD into my Mustang? I'm kinda new to auto work (trying to save money by doing as much work as I can).

Personally, I like having a decent acceleration... when I'm at the stoplight and someone decides they want to race, I'd like to be able to get the jump on them. I've got 3.0" gears now, but was thinking of changing them out to 3.55s for that little added jump off the line. Would running an AOD trans be better with the 3.55s than the C4 I have now?
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Old 02-23-2003, 05:07 PM
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yes, an aod with 3.55s will work better than a c4. Itll have a lower cruise rpm than a c4 with 3.00s and will give you that extra jump off the line.
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Old 02-23-2003, 05:43 PM
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Is a C4 to AOD an easy swap? What kind of work does that entail? Where can I find an AOD that will work on my stang? Is this something that a "backyard mechanic" can do or something I should just go to a shop and say "I want an AOD, make it happen"?
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Old 02-23-2003, 09:08 PM
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I put an AOD into my 66. Its not hard to do, as long as you have access to a chassis lift, transmission jack, and know how to pull a tranny. You will need a new crossmemeber, shift linkage, shorter driveshaft, TV cable, blockplate, and possibly a new flexplate. Check out www.windsor-fox.com. They specialize in these swaps.
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