70 Cougar AOD conversion w/ FMX tranny question

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lithi78
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70 Cougar AOD conversion w/ FMX tranny question

#1

Post by lithi78 »

I have a 70 Cougar with a 351 Cleveland 4bbl and a FMX tranny… man it is gas guzzler… Has anyone done a AOD conversion and if so what are the benefits? How much more gas mileage are you getting out of the AOD. I’ve seen kits out there for the AOD conversion but can anyone make recommendations on where to get the kits?
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jcbingcougar
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Re: 70 Cougar AOD conversion w/ FMX tranny question

#2

Post by jcbingcougar »

I have done the conversion. On the freeway at 70 mph, I get close to 20 mpg with the A/C blowing cold. In the city, I see little, if any improvement to gas mileage. An added benefit is the ability to have a conversation without yelling over the noise created by 3000 rpm.

I didn't purchase a kit because you don't really need one. You need the transmission, the cross member, new transmission cooler lines and a TV cable and mounting bracket from Lokar. I may be forgetting something but that's about it.

The addition of an AOD is one of the most enjoyable modifications I've done to the car and would do it again.
Jeff Bingaman
1970 Cougar
1956 Ford F100
1960 Dodge Phoenix
2017 Mustang GT Premium
2017 F150 Platinum
Caleb
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Re: 70 Cougar AOD conversion w/ FMX tranny question

#3

Post by Caleb »

When you did your conversion did you have trouble with the exhaust or tranny tunnel? The aod is quite a bit bigger I thought. I'll most likely do the conversion at some point as well but want to make sure I have all my bases covered first.
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jcbingcougar
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Re: 70 Cougar AOD conversion w/ FMX tranny question

#4

Post by jcbingcougar »

No trouble with the transmission tunnel. My exhaust wasn't built until after the transmission was installed.
Jeff Bingaman
1970 Cougar
1956 Ford F100
1960 Dodge Phoenix
2017 Mustang GT Premium
2017 F150 Platinum
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dmac
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Re: 70 Cougar AOD conversion w/ FMX tranny question

#5

Post by dmac »

Do you have any recommendations on a donor? What would be the best year and vehicle to pull one from? Thanks
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1969XR7Vert
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Re: 70 Cougar AOD conversion w/ FMX tranny question

#6

Post by 1969XR7Vert »

Not sure of what year, but definitely not this year:

Image
Isabel, the realization of a seven year long dream:



Canted--Texan on the351cforum: "One of my most impressive attributes is that.......a lot of people don't like me.....or the horse I rode in on"
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1969XR7Vert
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Re: 70 Cougar AOD conversion w/ FMX tranny question

#7

Post by 1969XR7Vert »

P.S. I have a good, rebuildable core from a Fox body Mustang if anyone is in need (and there is one application for a donor).
Isabel, the realization of a seven year long dream:



Canted--Texan on the351cforum: "One of my most impressive attributes is that.......a lot of people don't like me.....or the horse I rode in on"
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cougarshaman
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Re: 70 Cougar AOD conversion w/ FMX tranny question

#8

Post by cougarshaman »

anything after 84 from a Mustang is the general rule, so you get the right short tailshaft, shift arm, and stronger internals. They were made from 80 to 92 or early 93 (or 94 depending on who you axe).

But it's always best to rebuild or at least go through and check any donor trans before you install it. Or pay a shop to do it. It's a pain in the neck to find that a trans that's been sitting around for 20 years is leaking or has some internal hang up that makes 3rd gear not work or something like that. An ounce of prevention.

I miss Socalcraigster. :*(
Andy White- 70 standard since 1987 (Hit by a tree on the cowl, but on the mend) :wall:
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BadBoyJ
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Re: 70 Cougar AOD conversion w/ FMX tranny question

#9

Post by BadBoyJ »

Just did this swap on mine 351w w/fmx to AOD. Had to change the h-pipe , stock h-pipe wouldn't fit around transmission. You'll need to change shifter arm on the transmission or modify it to work with the stock shifter.
John

1969 Cougar Eliminator (Yellow/Black)
1970 Ford Ranchero ( M-code )
2005 F-250 crewcab 4x4
2014 Dodge grand caravan( wife's car )
2007 Yamaha WR450 (gots to play in the DIRT)
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9F91H581221
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Re: 70 Cougar AOD conversion w/ FMX tranny question

#10

Post by 9F91H581221 »

Bob,
Is that the FMX tranny? Thank you for not posting the XXX tranny.

Installing an AOD....

You will need a slip yoke, cut your original crossmember, Lokar KD2-AOD-HT cable, modify your shift lever or find an E9SZ shift lever, modify one cooler line, get longer bell housing bolts. You can use the FMX block spacer plate, but most likely the inspction cover will not bolt to the AOD bell. I don't bother with the inspection cover myself. The dipstick and tube are specific to the AOD---the FMX won't work.
There are two different length AOD. Lincoln and Econoline are longer. The FMX is 30 1/8" and so is the short AOD. The best AOD to get is the 89 T-bird Super Coupe---unlikely to rummage across one of them. Get a 5.0 Mustang AOD. NO AOD's before 86.
The stock Y-pipe will conflict a little bit with the rear of the AOD.
As fas as cutting your crossmember: During installation, you will see the crossmember is triangle shaped. I cut off the part of the triangle that extends forward to provide clearance for the AOD pan. Then the crossmember will hang off the rear sides of the bolts only. I've done several this way.
If you can't find a shift lever, let me know. Back in the day, I built a jig to modify the AOD lever for the correct radius.
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