Automatics ?4R70?

[DBMSTNG]

how much do you BET. haha ever get BEAT?

i bet that it won't break every time i beat on it.

 

[4point6]

I've had no problems with mine either, but I also haven't modified anything yet. Hopefully that changes soon.

 

[fastangboi]

i bet that it won't break every time i beat on it.

True that... its a Ford! i was just makin fun of your misspelled word

 

[fastangboi]

It's a 9.5 for the high stall converters. It's an 10.5" or 11" stock. But you're right...they (the aftermarket) only offer one diameter.

Ok, the sites ive been on have given general sizes 9" 10" 11" 12" and i understand thet the smaller the converter the higher the stall. BUT they also advertise different patterns to bolt up to the flexplate. ive read that guys have bought converters for thier 4r70 and got the wrong bolt pattern. get me?

 

[TGJ]

What year of car is the 4R70W in? A 2004 Mustang GT had the 4R75W. 98 and older 4R70Ws are weaker than the 99+ ones.

The stock TC's are either a 12" TC or an 11.25" TC. They have either a 6 or 8 bolt flywheel depending on the 4.6. The 12 and 11.25" TC have a different bolt pattern . You need to know what TC your car has and go from there.

I would only look at 3 aftermarket TC's. CircleD's single disc( http://www.circledspecialties.com ),BC Automotive's single disc( http://www.bc-automotive.com ) or a PI Triple Disc( http://www.converter.com ). Everything else, well I won't go there but I wouldn't use them in my car.

 

[fastangboi]

mine is a 2000 GT. And how would i find out what i have without tearing the car half appart and killing a whole day?

And i dont care about crank to flexplate, its the flex to converter i need to find out.

 

[TGJ]

You have an 8 bolt crank and a 11.25" TC. You should be ok with any aftermarket TC as long as it is not based on the 12" TC pattern.

 

[TGJ]

Ford used either a 6 or 8 bolt crank, depending on the car. That matters on which flex-plate to use. Ford also used a 12" TC and an 11.25" TC, the bolt pattern to connect these TC's was different. Most aftermarket TC's use the 11.25" pattern to connect to the TC to the flex-plate.

 

[d98gt]

What year of car is the 4R70W in? A 2004 Mustang GT had the 4R75W. 98 and older 4R70Ws are weaker than the 99+ ones.

I believe 96-03 is 4r70w while the 75w happened in 2004.

 

[TGJ]

My question was for the original poster as to what year of car they are looking at. I know that the 04 GT got the 4R75W and the 96 - 03's had the 4R70W.

 

[d98gt]

Maybe he'll chime in.

 

['01 Steed]

Ok, the sites ive been on have given general sizes 9" 10" 11" 12" and i understand thet the smaller the converter the higher the stall. BUT they also advertise different patterns to bolt up to the flexplate. ive read that guys have bought converters for thier 4r70 and got the wrong bolt pattern. get me?

When you call Circle D and place your order, they'll know what you have.

BTW, TC diameter has nothing to do with stall speed. The smaller diameters are desirable because they have less inertia, and won't "balloon" at higher rpm.

 

[fastangboi]

i have never heard of "ballooning" problems. but i have just noticed that converters get smaller when the stall gets higher.
And is the 75w better than the 70w? maybe lower or taller gear ratio?

 

[TGJ]

A stock 4R75W will handle a little more torque than a stock 4R70W. I don't recall the difference, but I do not believe they are a drop in replacement in a 4R70W equipped car.

 

[ProCharger GT]

I think you'll be fine with a 4R70W.

 

['01 Steed]

i have never heard of "ballooning" problems. but i have just noticed that converters get smaller when the stall gets higher....

Never-the-less...

 

[Trav4011]

So, exactly what kind of power will the auto hold?

 

[TGJ]

Depends, a properly built 4R70W like mine will handle 650 HP and 7000+ RPM. A stock 4R70W is hard to determine what they will hold. I have seen cars with over 400 RWHP with a stock 99+ 4R70W behind it and not break and I have seen relatively stock N/A 4.6L break one.

For those looking for info on how to have a well built 4R70W like mine. Go to http://www.tccoa.com/articles/tranny/index.html and check out the Ford OD Transmissions 101 article. There is some updates though that the article does not have in it.

 

[ProCharger GT]

Pre-rebuilt 4R70W was starting to slip around 380 RWHP, but it also had about 75K on the dial. After upgrading all the internals, converter and tranny cooler, it's no problem at all w/ around 500 to the wheels, shifting about 6700 RPM.

 

[Mike97gt]

A stock 4R75W will handle a little more torque than a stock 4R70W. I don't recall the difference, but I do not believe they are a drop in replacement in a 4R70W equipped car.

HMM I thought they were pretty much the same.. I wonder what would have to be changed? If somebody has done this swap I hope they post to this.