need to know 1970 gtx torque converter

[hill]

I have a 1970 gtx with 440 and 727 TF. When i bought the car there was no torque converter or flex plat I am getting ready to put the motor and trans in and i need to know what i need as far as the converter goes. The parts store said there were 2 different ones an 11in and a 12in. any one know what the deal is with that.

 

[69 Runner]

Parts store?

Go here. Call these people http://www.phoenixtrans.com/

 

[hill]

Parts store?

Go here. Call these people http://www.phoenixtrans.com/

I am not going to get it from the parts store I was just trying to get some info.

 

[hill]

The smaller of the two is the performance convertor. Check behind boat cars, trucks, regular performance cars, and you'll find the big convertor.

so what your saying is i need the 11in

 

[69 Runner]

Call Phoenix. Tell them what you want, and that's what you'll get. They build their converters in house

 

[hill]

Is there only 1 flex plate for the 440 727TF or does it depend on the torque converter size. The best i can remember there is only 1 for that combo

 

[69 Runner]

Just one best I know

 

[hill]

Nope, there're actually two. One for each size. I know I have an extra large one laying out in the garage, but I think the only small one I have is in the car. If I have one of each, I'll take a pic of both and post them side by side

Thats good to know! Now i need to get the smaller one and the 11in converter
Oyea are the splines the same for the 2 converters

 

[GTXperience]

First of all, welcome to FBBO hill! Choosing a convertor for your setup isn't difficult but unless I missed something, I don't know much about your drivetrain (besides it being a 440/727) and what you are going to be doing with the car in terms of its intended use - street, street/strip, etc. Can you give us more info and besides just motor/trans specs, possibly include gear ratio, tire size, etc.)?

 

[hill]

OK I just found out i need a 2800 stall How do I tell if the motor in external balanced or internal balanced. The motor was rebuild when i got it and no specs were given so i pulled the cam , heads and the oil pan. The crank looks cast but has been balanced along with the new rods with 0.30 dome pistons. The cam is 284/296. Dont know the gear ratio (will change if needed not worry about that right now)

 

[69 Runner]

How did you find out you "need" a 2800 stall? A cast crank 440 will have a thick balancer and can (for cubic dollars) be internally balanced. The cast and forged crank motors use the same rods btw

 

[hill]

How did you find out you "need" a 2800 stall? A cast crank 440 will have a thick balancer and can (for cubic dollars) be internally balanced. The cast and forged crank motors use the same rods btw

I pulled the cam and ran the numbers on it. It is a comp cam. When you say thick how thick. I called the those guys on the stall and He looked it up and said I need external balance so that what they sent

 

[hill]

Oh yea thanks all of the help

 

[69 Runner]

Okie dokie. Makes sense to me. The forged cranks have a (relatively) thin balancer that is probably about 1 1/4" thick and is "even". The cast balancer is thicker and (if you look at the front) is asymmetrical....and probably says cast crank on it as well:grin: