Swapping in a 4R70W into a 91 GT 5.0 Stang: Any pointers?

[Duce Apocalypse]

Hello, I just ofund this form searching for some info on this conversion, this last weekend I seemed to have tossed my AOD's direct clutch thanks to the TV cable popping off my TB and me not knowing aobut it, now the car wont shift from 2 to 3 much less 4.

Anyhow I know the 4R is a better tranny, and I dont wanna have to deal with that stupid TV cable possibly coming off and f'ing up another trans. plus the wide ratio gears look like they would pep the car up as it always felt a little lazy with the AOD.

The car is basically stock for now but I plan on popping in a 331 in the future, probably in the 400-500 whp range. Now I have read that a 98+ 4R tranny with one of Baumann Engineerings VB kits can hold up to 500 horse, which would put it in the power handeling around what im looking for. what I dont know is if they meant the V6 tranny or not since the V6 tranny has the SBF bell patteren that I would need.

Now here are my questions:

How much HP can the V6 4R hold before the VB mod?
what stall is the stock converter? would this likely change behind a 5.0? I'm looking for a stall in the 2500 RPM range initially.

Also when did ford remove the speedo gear from the tail? I know this musta been sometime in the early 2000s

Has anyone else done this particular swap?

I know I need the following:

Baumann TCS,
backset crossmember,
4r Tranny (obviously)
There seems to also be a question if the driveshaft will work without mods,


what else is needed to make this conversion?

Kind regards,
Duce

[JamiesBudd]

Hey Duce have you ever heard of any one diong such a swap?

[liquid_02]

I'm also curious of this, as I am in the process of doing this right now, Just ordered my Baumann TCS and wiring harness yesterday, picked up a 4R out of a 2000 V6 Mustang on Friday for $400, going to put in the extra clutch and go through it before i toss it in.

What I can tell you about the speedo cable, the 2000 I picked up has a gear in it, so at least to 2000 will work.

What I would do if I were you, like I'm going to do, just bolt the thing in and see how it holds up, why re-build it to be stronger if there's nothing wrong with it? When you break something then you rebuild it and put the stronger piece in its place, that way you only pay once, that is if you have to pay someone to do it for you.

To give you an idea of what this is going behind, and I'm not even touching it, it's going behind a 408w in a 92GT, so there's lots of power going through this thing.

All I really want to know is if an AOD shifter will work with this thing, my car's a 5-spd right now so I don't even have one to fool around with. Want to put the B&M hammer shifter in to keep my console.

Anybody know this?

[1sxyfox]

so do these tranny just bolt right up to the fox body cars? nothing really to change? now you have me looking at this idea insted of going back to an aod.

[liquid_02]

the 3.8 ones out of a mustang do, 5.0 and 4.2 ones do aswell. The only thing is it's slightly longer so tranny mount needs to be moved, I have a new un-welded cross-member, so hopefully I'll just be able to slide it back and weld it, if not I'll just weld a plate to the existing crossmember.

[1sxyfox]

how do you control the shifting though if you swap one of these in?

[SilverFox]

How much HP can the V6 4R hold before the VB mod?
Reliability is sacrificed in terms of clutch/band life, but for the most part the stock VB will still handle the power, just not in the long run due to the slip. I would suggest a VB kit no matter what or a custom vb.

The V6 is SBF pattern and same internals as the V8.


what stall is the stock converter? would this likely change behind a 5.0? I'm looking for a stall in the 2500 RPM range initially.
The murader stall is said to be the highest at about 2400 I do beleive in healthy HP applications.


Also when did ford remove the speedo gear from the tail? I know this musta been sometime in the early 2000s
First in trucks about 02, by 04 all the gears were gone.


Has anyone else done this particular swap?
I have done the swap, and I know several others. I have done it with a MVB and with the Baumann TCS computer.


I know I need the following:

Baumann TCS,
backset crossmember,
4r Tranny (obviously)
There seems to also be a question if the driveshaft will work without mods,
Crossmember will need to push back 1", easy. You will need a shorter shaft...1" :)
Cooling system runs backwords compared to AOD, just to let you know.


what else is needed to make this conversion?
The biggest job is the TCS, buy the harness!

[SilverFox]

All I really want to know is if an AOD shifter will work with this thing, my car's a 5-spd right now so I don't even have one to fool around with. Want to put the B&M hammer shifter in to keep my console.

Anybody know this?

Sure it will, so long as the shifer lever on the trans is mustang or universal 2" center version. The c4/aod/aode/4r all basicaly use the same exact gate pattern so long as the shift lever on the trans is correct.

[SilverFox]

1sxyfox:

Your control options are several aftermarket controlers, 94/95 EEC/harness swap, or manual vb.

The swap is awsome for turbo guys and a MVB.

I did the TCS computer with one in a MarkVII, it was great having the gearing and LU, however I never got the TCS to do exactly what I wanted....I think a MVB would be the way to go.

[flamingvert1989]

let us know how it goes i am thinking of doing the same swap for my vert.

[JamiesBudd]

Does anyone know 4R70w hp limit stock ? Ya got me really lookin into this swap also. Will it handle a 450 fwhp 331?

[JamiesBudd]

Deos anyone have an idea what the hp limit is on stock 4R70W? Will it handle 450 fwhp 331?

[liquid_02]

Sure it will, so long as the shifer lever on the trans is mustang or universal 2" center version. The c4/aod/aode/4r all basicaly use the same exact gate pattern so long as the shift lever on the trans is correct.

Thanks!

The shift lever on the trans is the one that came with the trans, off a 2000 Mustang, so what you're saying is that it should work? I just got the hammer shifter today, just waiting for the cable to come in then I can play around with it.

Another question, since you did the swap, what flexplate did you use? I'm looking for an SFI one, as I might as well get an SFI one since I have to buy one anyway. Tried contacting B&M about their holeshot converter but they apparently have the most useless techs I have ever spoken with. So I'm probably going to avoid their converter since they cant tell me even the simplest thing about it. Talked to TCI but the converter they want to sell me is about $1200, which converter did you use aswell?