360 727 converter question

-
Muswagon

Muswagon

Well-Known Member
Joined
Jan 20, 2020
Messages
370
Reaction score
279
Location
Winnipeg
Buying a newly rebuilt 727 and converter that was on a buddy's older Cuda (68) with a 340.

I researched but was fairly confused...but maybe I get what I need to do?

The 340 is most likely internally balanced, so the converter will be zero balance. I have read that some later 340's are externally balanced, however, the counter in that case would be done with the flexplate....both internal and external 340's would use same converter?

There is a B&M flexplate that will allow me to use the zero balance converter on my 360.

If I have this wrong, do not be shy. I tried my best to search and understand but this is so different from the old dark world of Chevy and Ford that I am from (and even then I know enough to only be dangerous)

Thanks!
 
Last edited:
Muswagon said:
Buying a newly rebuilt 727 and converter that was on a buddy's older Cuda (68) with a 340.

I researched but was fairly confused...but maybe I get what I need to do?

The 340 is most likely internally balanced, so the converter will be zero balance. I have read that some later 340's are externally balanced, however, the counter in that case would be done with the flexplate....both internal and external 340's would use same converter?

There is a B&M flexplate that will allow me to use the zero balance converter on my 360.

If I have this wrong, do not be shy. I tried my best to search and understand but this is so different from the old dark world of Chevy and Ford that I am from (and even then I know enough to only be dangerous)

Thanks!
Click to expand...
No, the late '72 & '73 340s used an externally balanced convertor, ie weights welded onto the convertor itself FROM THE FACTORY. Aftermarket pieces will allow you to use a zero balance convertor and balance it via the flexplate on the later engines, but this is not how the factory did it; that's only in the aftermarket. '68- early '72 were internally balanced. As long as it's a neutral balance convertor, the B&M flexplate will allow you to run it on your 360. If it's an externally balanced 340 (different from the externally balanced 360) convertor, you'll have to source a neutral balance one to run with the B&M flexplate, or find a factory 360 727 (wieghted) convertor.
You need to figure out what you've got and then plan accordingly.
I know, clear as mud, eh?
 
Ok gotcha. Was for sure confused how they did the 72/73 340, appreciate the explaination.

Being told it is a neutral converter which i will be able to confirm tonight when I see it. Is the B&M 10236 the correct flexplate?
 
Get it and look at the converter, it will be obvious. If it has the weights, it's for a externally balanced motor aka your 360. If not, get the flex plate.
 
318willrun said:
Get it and look at the converter, it will be obvious. If it has the weights, it's for a externally balanced motor aka your 360. If not, get the flex plate.
Click to expand...
The external 340 balance is different from the 360 balance, still has a weight just different size.
 
318willrun said:
correct. My mistake. I guess I'd knock the weights off (if any) and run the BM flexplate
Click to expand...
Yes, but CAREFULLY! I've seen guys crack or grind through the convertor body trying to knock the weights off. Language really gets creative then!
 
Professor Fate said:
Yes, but CAREFULLY! I've seen guys crack or grind through the convertor body trying to knock the weights off. Language really gets creative then!
Click to expand...
I just knocked the weights off this converter for the 318.... I showed how I do it, maybe it will help the OP if he has to do it.
If he starts at 1:20....
 
B&M 10236 is correct for a neutral balanced converter behind an LA 360 only. If you have a Magnum 5.9L 360 other arrangements will have to be made.
We are assuming you meant LA version 360.
 
You must log in or register to reply here.
-

Back
Top