727 Transmission torqe converter

[Bob]

While reading one of the other strings I learned something about torque converters.
About a year ago I had a 727 attached to a 1972, 440 forged crank. I sold the engine and attached the 727 to my 1974, cast crank 400 engine. Do I now have an issue with the torque converter since apparently one is ballance and one is not? If I do, can I just take my old converter and install on this transmission?
Thanks
Bob

[twinscrew698]

Yes you will have an issue! Vibration issues!
U can knock off the balancing weights on the Forged Crank converter or u can just use just use the converter that came with the cast crank 400..
Some might have a better idea but i believe this is the right way!

[Bob]

Yes you will have an issue! Vibration issues!
U can knock off the balancing weights on the Forged Crank converter or u can just use just use the converter that came with the cast crank 400..
Some might have a better idea but i believe this is the right way!

I guess I could get to them through the access plate with out having to drop the whole tranny.

[68coronetGLwannabe]

I figured this out to from another thread. All I did was change the converter using the same trans. Had about 100 miles on it before the change and the conv. was all beat up from the vibration.

[Bob]

I figured this out to from another thread. All I did was change the converter using the same trans. Had about 100 miles on it before the change and the conv. was all beat up from the vibration.

Ouch! I'm glad i don't drive that much. I guess when I do the cam Ill change the converter.

[John_Kunkel]

Yes you will have an issue! Vibration issues!
U can knock off the balancing weights on the Forged Crank converter

Hold on there, the cast crank 400 needs weight(s), not to have them removed. The only forged 440 crank that needs weights is the '70-'71 HP, all other forged 440's have no weights so there would be none to remove on a '72.

The original converter that came with the 400 would be the one to use.

[Bob]

Yes you will have an issue! Vibration issues!
U can knock off the balancing weights on the Forged Crank converter

Hold on there, the cast crank 400 needs weight(s), not to have them removed. The only forged 440 crank that needs weights is the '70-'71 HP, all other forged 440's have no weights so there would be none to remove ojn a '72.

The original converter that came with the 400 would be the one to use.

Thank you John.

[twinscrew698]

Sorry Bob!! Got it Backwards!As Its always better to double check.as in this case!
I found out the hard way! Way back then before computers and after a crank replacement!

[Bob]

Sorry Bob!! Got it Backwards!As Its always better to double check.as in this case!
I found out the hard way! Way back then before computers and after a crank replacement!

No problem. It's not like I ran out and did it last night. 
Thanks
Bob

[firefighter3931]

Yes you will have an issue! Vibration issues!
U can knock off the balancing weights on the Forged Crank converter

Hold on there, the cast crank 400 needs weight(s), not to have them removed. The only forged 440 crank that needs weights is the '70-'71 HP, all other forged 440's have no weights so there would be none to remove ojn a '72.

The original converter that came with the 400 would be the one to use.

John is correct, as usual ! 

The original 400 cast crank converter will have weights so it can be re-used with the stock flexplate.

B&M makes a special flexplate to adapt a non weighted converter to an external balance (cast crank) engine. There is a scalloped cutout in the flexplate that compensates for the missing weights that would normally be required for that application. Just another option if you didn't have a weighted converter on hand and wanted to use a forged crank converter on a cast crank application.

Bob, a stock converter will work fine with the cam that we picked out for your build....you're good to go 



Ron