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FMX to AOD

January 12 2008 at 11:07 PM
  (Login Gdog3225)
from IP address 72.161.43.171

 
I have a 1955 f-100 and a 351 windsor with an fmx. i already have the fmx up and operating. i was wondering how much trouble it would be to swap it over to aod. as far as driveline and bellhousing. then the shift linkage and passing gear and all of that stuff. i have very little knowledge and would appreciate all the help i could get. thanks

 
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AuthorReply

(Login stuart40a)
Forum Moderator
142.165.145.207

Re: FMX to AOD

January 12 2008, 11:15 PM 

Throttle pressure control is going to be the great problem.

Getting the correct geometry is critical.

The output shafts are a different diameter as well.
The rest is common sense.

 
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(no login)
72.161.43.171

Re: FMX to AOD

January 12 2008, 11:19 PM 

what u mean by that?? its a carb engine. how much longer is the tail shaft on the aod than the fmx?? will i have to have my driveline cut or can i make the difference up in the yoke??

 
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(Login stuart40a)
Forum Moderator
142.165.145.207

Because

January 12 2008, 11:29 PM 


FMX and AOD control throttle pressure by different methods.

FMX uses engine vacuum and AOD uses linkage only.

The kd for the FMX can not be adapted to the AOD to control it.

There are several different lengths of FMX so without knowing what you have it is impossible to say if you will need a different length drive shaft.
As for the yokes they use different ujoints so yours will have to be cut to accept the alteration or get a different shaft.


 
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(no login)
72.161.43.171

Re: Because

January 12 2008, 11:34 PM 

so r u tellin me it will be virtually impossible or impossible without a lot of work??

 
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(Login stuart40a)
Forum Moderator
142.165.145.207

Nothing is impossible.

January 12 2008, 11:45 PM 

But it isn't a bolt in conversion.

If the throttle pressure isn't right on you will smoke the transmission within a few blocks.

 
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(no login)
72.161.43.171

Re: Nothing is impossible.

January 12 2008, 11:51 PM 

how can u set the throttle pressure?? im sorry i sound like a complete idiot.

 
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(Login stuart40a)
Forum Moderator
142.165.145.207

No problem.

January 13 2008, 12:01 AM 

It's better to ask now before you smoke one.


You need an entire carb from an AOD equiped vehicle.
Plus the linkage from it to the transmission.

Or you can use an aftermarket cable set up for this application.

Don't be afraid to ask questions.

 
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(no login)
72.161.43.171

Re: No problem.

January 13 2008, 12:05 AM 

well i got an edelbrock carb so could i get a linkage from lokar that would work?? as far as bell housing bolts they r the same right?? and the fmx is out of a 79 thunderbird. so that might tell u what size case it is.

 
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(Login stuart40a)
Forum Moderator
142.165.145.207

Ok.

January 13 2008, 1:17 PM 



The Lokar cable will work but it takes patience.

Housing bolts are a tad longer in an AOD.

The transmission length should be very close.

 
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Anonymous
(no login)
72.161.43.195

Re: Ok.

January 13 2008, 1:29 PM 

so if i had the yoke out of the aod i could use my shaft if i had the same joint to combine it with the driveshaft?? how hard is it to adjust the linkage to get it to work properly?? is the aod a lot fatter than the fmx?? my pipes run down beside of the fmx now. it shouldnt be much wider than the trans now. how much difference is there in the yoke of the aod and the yoke of the fmx?? does the aod have a bigger u joint or what??how is it set up??

 
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(Login stuart40a)
Forum Moderator
142.165.145.207

Re: Ok.

January 13 2008, 10:01 PM 

so if i had the yoke out of the aod i could use my shaft if i had the same joint to combine it with the driveshaft?

The AOD yoke is smaller and so is the ujoint.

how hard is it to adjust the linkage to get it to work properly?

You must work with a pressure guage.

is the aod a lot fatter than the fmx?

They are close to the same size.


my pipes run down beside of the fmx now. it shouldnt be much wider than the trans now.

how much difference is there in the yoke of the aod and the yoke of the fmx?

There is quite a difference in the diameters. AOD is smaller.

? does the aod have a bigger u joint or what??how is it set up??


 
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(Login Gdog3225)
72.161.43.195

Re: Ok.

January 13 2008, 10:42 PM 

so as far as cutting the shaft i wouldnt have to just have to change end to fit the smaller u joint. i found some measurements on the fmx and aod and was curious i they were accurate. aod overall 3 3/4" and fmx overall 30 1/4"

 
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Paul
(Login tbirdtess)
74.77.15.218

Re: Ok.

January 14 2008, 11:16 PM 

Fmx To AOD

Yes the trany's will interchange.

I have done it. The linkage is paramount!!

The Length & width are close. The yoke is different. I bought A U-Joint from Advance. Looked threw there book & compared the sizes. Found One that worked.
There is Width & Cap size. You must know where the shaft & yoke came from.

You will not find a Carbed Car with an AOD. The 85 had the VV induction.
Similar to a carb. But didn't use a cable system. It used a Kick-down rod.

I run a 351W & the AOD in my 1990 Thunderbird Factory Stock Oval track car.
I am still trying to get the linkage right. Tried the kick-down rod but the 351w
is too wide for the rod. I went to the cable style but couldn't find a carb end linkage bracket. Made my own, still not right. I manual shift + I run in second gear. The only reason I took the FMX out was that I broke it.

I T-boned another car that spun out in front of me. Broke both Engine Mounts & the trany mount. the shifter cable & gas pedal cable held it back. Bent both brackets. The carb went to WOT & the trany hit R.

Paul

For Optimal Race Domination

 
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(Login Gdog3225)
72.161.32.40

Re: Ok.

January 14 2008, 11:25 PM 

so paul will the lokar cable work?? or do you know have u tried it?? thanks for the information. so it is possible to get a u joint that will match my shaft i have now and the joint for the aod yoke?? did u have to move ur mounts or anything??

 
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(Login stuart40a)
Forum Moderator
142.165.145.207

Re: Ok.

January 15 2008, 7:43 AM 

Yes the Lokar cable will work.
Although "carbed" and I used the term loosely, systems used a different method of controlling pressure it was more than just a KD rod.

Ujoints can be mixed and matched to come up with the correct combo.


 
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Paul
(Login tbirdtess)
172.165.145.247

Re: Ok.

January 15 2008, 10:26 AM 

THe early AOD used a pressure rod. This rod is spring loaded.
Used from 1980 to 1985. They started using a cable is 1986. the same time they switched to EFI.

The lokar cable is made for use with the carb. At $100.00 & does not look stock, keeps me from using this part.

I need the second gear ratio. As the FMX & AOD have the same ratio, 1.47.
The C4 & C6 have a Higher gear, 1.46. (Gear rule thing)

Going to try the 4r70W with No computer. Its second gear ratio is even lower at 1.55

Paul

For Optimal Race Domination

 
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(Login stuart40a)
Forum Moderator
142.165.145.207

yabut

January 15 2008, 9:08 PM 

We may be talking apples and apples.

No matter what system was used it still required proper adjustment or the transmission would self destruct in short order.

 
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