FMX to AOD on a 351c

351carlo · Jun 9, 2004

Hey guys,

Well the trans is more than likely shot. Now I need to go with an AOD Transmission, just so I can throw some 3.73's or 4.10's in my rear. I also want something that shifts hard, and will withstand the RPMs. I'm gonna get the transmission built for me, but what else do I need to bolt this up? What kind of flex plate is necessary? Driveshaft length gonna bolt up? I know about the TV cable/rod. I just need to know in addition to the transmission, how much more it will cost for this swap.

THANKS Carlo

bnickel · Jun 10, 2004

since you already have the fmx you're in pretty good shape. the flexplate should work as is, and the fmx crosmember can be modified to work. basically you just have to get the tv cable and possibly the shifter linkage, but i have heard of people geeting the factory linkage to work. you'll probably have do some mods on the cooler lines and you might have to get a different yoke for aod.

351carlo · Jun 10, 2004

Driveshaft though....

Will the FMX and AOD come out to the same length? This would be amazing, because I'm not quite ready to order my Aluminum driveshaft. Summit has these for 160 now...I thought it was a steal.

Cantedvalve · Jun 10, 2004

Did it last fall with 3.89 gears. VROOM BABY!!

My advice would be to NOT modify your crossmember. Get an after market piece and sleep well knowing it is built well. I do not know that the FMX flexplate will work... if it does, I wasted that $100. If you do get an aftermarket, be sure you get the right (28oz) balance. Also, your stock FMX starter will work, so dont go buy an AOD one.

I spent probably $2600 including everything. I went with an Art Carr AOD. PLEASE do NOT skimp on the transmission. I have seen others do this, and it ends up costing you 4 times as much.

Clark · Jun 10, 2004

The AOD transmission is about 3/4 in longer than the FMX and when I ordered my new trans yoke from NPD it was actually 3/4 in. shorter than the original yoke so no shaft needed at this time. The shifter linkage worked out with minor modifacation and one trans cooling line needed to be modified. As for the trans mount I am modifying my old one because that is one good piece of steel there and still should be strong enough. Don't forget to get longer 7/16 bolts for the block because the other one's are too short.

I forgot to add that I did reuse my 28OZ. FMX flexplate.

351carlo · Jun 10, 2004

Whoa

2600 is WAY out of my budget. Luckily when it comes to the transmission, a friend builds them, so my transmission will cost roughly 500, built to withstand whatever I can put into it.

I really need to know all the additional costs involved, that's my biggest factor.

Thanks guys.

Cantedvalve · Jun 10, 2004

351carlo said:
2600 is WAY out of my budget. Luckily when it comes to the transmission, a friend builds them, so my transmission will cost roughly 500, built to withstand whatever I can put into it.

I really need to know all the additional costs involved, that's my biggest factor.

Thanks guys.

Additional costs will probably come out to be $500 if you can use your current driveshaft.

ForceFed70 · Jun 10, 2004

Hold on... don't you need some sort of bellhousing adaptor to work with a Cleveland? A windsor should be no problem.. but will the AOD bellhousing bolt up to the cleveland block?

Cantedvalve · Jun 10, 2004

70_Nitrous_Eater said:
Hold on... don't you need some sort of bellhousing adaptor to work with a Cleveland? A windsor should be no problem.. but will the AOD bellhousing bolt up to the cleveland block?

Silly Nitrous_Eater... of course not!

351C shares everything smallblock in how it mounts to the car and transmission.

ratio411 · Jun 10, 2004

Nitrous_Eater:
Lots and lots of external parts/accessories swap between all the SBFs, Ws, and Cs. Even the 300 I6.
That's what makes Fords so much fun to do engine swaps (trans swaps too). It's a piece of cake.
Dave

351carlo · Jun 10, 2004

So say I fabricate my own cross member, and then use the current flex plate (assuming its the same), 500 extra?

Thanks guys,the input is much appreciated.

Max Power · Jun 10, 2004

Not sure how stout an AOD you can get for $500. I thought that parts alone would be more than that. If he doesn't replace the input shaft with a one piece unit, it won't be stout.

351carlo · Jun 11, 2004

The input shaft will be one piece. I'm not going to go into details on why it will only run me 500 for this, but that's all it's costing me. I definitely understand why you would be concerned, but I am highly assured it will be a great build, and yet only for around 500. The guy building it is a friend of the family, with a few favors owed.

So anyway, what stall converter would you guys suggest?

70 351c 2v with
Edelbrock 600
Hooker 1 3/4
Patriot Sidepipes

Soon to have
1.6 Rollers
Hydraulic cam, most likely 272
port and polish on the heads
flat top pistons
block .20 over

Just a sidenote, any idea what kinda power I would be laying down? I've got a friend in a lightly modified fox body (91) who wants to run when I'm done. When I put my 3.73's in the rear, I don't see myself losing.

Thanks all.

ForceFed70 · Jun 11, 2004

Well, crap... you learn something new every day!

So then a T5 behind a cleveland would be no harder to do than behind a 351W as well?

ratio411 · Jun 11, 2004

70_Nitrous_Eater said:
So then a T5 behind a cleveland would be no harder to do than behind a 351W as well?

I have never done it, but all the parts that would be used on a 28 oz 302 or 351w would interchange with the Cleveland perfectly.
I used to run 351c flywheel/clutch/etc... on my 302 in order to get the 11" clutch. The bellhousing is larger, but has the same bolt pattern and uses the same starter, it just spaces it out further to work with the bigger flywheel.
Dave

dartthower · Jun 12, 2004

what are you going to do with the FMX?i need a pump for mine.

351carlo · Jun 12, 2004

I'll sell it

You can buy the FMX off me. Make me an offer.
I was gonna get some cash for it off the guy building up the AOD for me.

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