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Senior Charter Member
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Discussion Starter #1
We are contemplating changing the transmission to an automatic in Miranda's Carriage. Would you guys mind sharing what we can expect in doing this swap?

Thank you,

Preston
 

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Premium Member
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4,186 Posts
I have a roadster with a manual and one with an automatic. I like them both and both have their place.

Check the width of the transmission you are considering to make sure it fits in the tunnel. Also get some good advice on which stall converter to install considering what engine you have, the weight of the car and the type of driving you want to do.

Regarding the value, I'm not sure the previous comment is accurate.
 

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You'll need a different bell housing, different drive shaft, different gears in rear end, need to fabricate shifter linkage, different spedo cable, and possibly a different starter. Oh yeah, maybe trannie mounts. Doable. Might even be fun....
 

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I had an AOD behind a 306 in my MKII, you'll need a new flywheel with the bell housing and starter, the driveshaft for an AOD is the same length as for some of the manual trans. I had to shorten mine to 10.5". Rear gears are use dependent, I started with 3.27 and changed to 3.73. As for the value - the most expensive Cobra ever sold was an Automatic. A little more info would be helpful, version of your FFR, type trans your looking at, i.e. AOD, AODE and your intended uses. I'm sure more will chime in with more info.
 

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I think it's a good idea. If it's what you want, then it's a good choice. Especially if it has a nice firm shift kit installed. Don't forget about the Trans cooler.
 

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Discussion Starter #8
Thanks. Still thinking it over. Not worried about value at all. Car will never be sold. Appreciate the comments. Please keep them coming.
 

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Blue Oval Scribe
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9,170 Posts
To perform an AOD swap you'll be looking at these items at a minimum Preston...

Trans cooler
Cooler lines
Block plate for AOD (that's the plate between block and trans Cobra Dreaming)
164-tooth flexplate (NOT a flywheel) that is balanced for your engine (331 should be 28 oz)
Transmission with torque converter
Transmission insulator/mount
AOD wiring pigtail for NSS (to ensure it starts in P and N only if you care and for backup lights if it has it)
Shifter assembly for trans tunnel with either rod or cable actuated linkage. You can use a stock '66 Mustang C4 shifter (period look like what Carroll did) or use an aftermarket shifter. Since the AOD does not have a 2nd gear detent any three-speed shifter will work (AOD is 1-3-OD on the detents).
Lokar throttle valve cable retrofit for the throttle body/carb so it will shift right.

Of course this is all assuming you want the AOD for the overdrive. You can do the same thing with a C4 three-speed for a little cheaper and the list will be the same except you won't need the throttle valve cable connection and the flexplate and block plate would be for the smaller 157-tooth setup of the C4.

Oh, and don't forget to remove the manual trans pilot bushing in the crankshaft end too! :yes:

HTH...
Mark
 

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The first transmission I had in my roadster was an AOD. I hated it. Swapped in a 4R70W. Loved it! Biggest addition required for a 4R70W is a transmission controller.

BBQLover - I sold my auto equipped roadster for $45K, and shifting with the paddle shifters was a lot of fun and the shifts were almost instant.

Pete
 

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The first transmission I had in my roadster was an AOD. I hated it. Swapped in a 4R70W. Loved it! Biggest addition required for a 4R70W is a transmission controller.

BBQLover - I sold my auto equipped roadster for $45K, and shifting with the paddle shifters was a lot of fun and the shifts were almost instant.

Pete
I'll admit that I have never considered an auto trans in a roadster...until I just read "paddle shifters," Pete! I'm intrigued by the idea. I'm not yet sure it's a match for me just, but it's definitely something to think about. (Like there wasn't enough already! :001_rolleyes: ) Any downsides that you experienced?

Thanks!
Shannon
 

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I'll admit that I have never considered an auto trans in a roadster...until I just read "paddle shifters," Pete! I'm intrigued by the idea. I'm not yet sure it's a match for me just, but it's definitely something to think about. (Like there wasn't enough already! :001_rolleyes: ) Any downsides that you experienced?

Thanks!
Shannon
The only downside was snarky people who think a roadster has to have a manual. In addition to the paddle shifters, I had a ratchet shifter, but I modified it to look like a manual. It was entertaining watching people at car shows trying to figure out what the buttons on the steering wheel were for and where's the clutch pedal?



I just had small buttons on the steering wheel for shifting, but there are several companies who make paddles: Shrifter® Paddle Shifter: Universal (Ford, Mopar, Nissan, etc.) Shrifter® Paddle Shifter Universal Fit [10063] - $559.00 : Twist Machine, Paddle Shifters, Billet Accessories, Hot Rod Supply
 

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MKI Owners Club
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1,351 Posts
I've had an automatic since day one. Just recently covered up the plain mustang shifter with a more appropriate shifter cover..

With the limited foot room in my MKI, I'm glad I went with the auto


 

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If you go AOD, the torque converter is particular for that transmission. Make sure you get the right one.
 

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I have an AOD in my cobra and I'm really not sure you'll need a trans cooler. I do have mine running in the standard opening that would normally house the oil cooler. I can run my roadster all day and rarely see temps over 130*. I've heard that the cooler the transmission the longer it'll run, but I'm not really sure it's going to make a measurable difference over the miles that we typically run.

Having a transmission cooler seems like safe insurance, but I doubt we really *need* it for such a light car and minimal miles. Just my 2 cents.

Mark
 

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This is from one of my other threads, it may be of some help. As for owning a roadster with an automatic, I think its great. My AOD has been lighlty modified with some stronger elements and a manual/auto valve body. I have a ratchet shifter which lets me control the shift points if I want to or not. If I recall my torque converter stall is at 2400 (I think...). It shifts almost instantly.

As an update since I had a forum member request some additional photos of this modified A-frame installed, here are some photos of it. Hopefully this might help some others.



In this photo you can clearly see where the cross-member bar was cut in half on the vertical and a piece of 3/4" strap steel was welded in to make clearance for the pan bolts for when it needs to be removed:




This one is zoomed in on the strap steel part, sorry for the blurriness:
 

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Blue Oval Scribe
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9,170 Posts
I only mentioned the trans cooler, as the FFR radiator does not come with a trans cooler loop in it. If the donor radiator is being used, then by all means plumb the cooler lines through it, but for the FFR aluminum you'll need an external cooler...

HTH...
Mark
 

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I made the switch from T 5 to AOD this year after thinking about it for two years. I absolutely love it. One of the main things I like is all the room in the footbox with the pedal out of the way.

I had to do a lot of the stuff mentioned above. I did install a cooler. I have Tangent's light kit in the lower opening but mounted the cooler behind it. I still need to install a gauge.

I had to re-do the transmission cover since the shifter is way further forward.

I kept all the T5 stuff, including the tranny cover so a guy could switch back easy.

Very happy with the change. I've had a bunch of nay sayers when they see it but a couple of them have driven it before and after and they all LOVE it. I can just roll into the throttle and light 'em up!

Bob:yes:
 

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Just completed C-4 to duplicate Shelby's favorite ride

C-4 No major cutting frame, fits perfect, drops in like 1965.
See tag line below. Everything delivered to garage door by SUMMIT.
Whole package. Naysayers have never driven PS, PB, AUTOMATIC Cobra!
PM me for real facts no BS. In FL ? Come to Tampa/Clearwater for a ride!
Lets you really enjoy the car! IMHO :wave:
 
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