Looking for the correct torque converter for a 727 auto mated to an LA360. Pretty sure this is where my vibration issue is coming from. I checked the balancer and flex plate and it is correct for an externally balanced engine. What all needs to be addressed/determined, if anything to narrow down the correct converter?
727 Torque Converter
- Thread starter Mcfarlrm
- Start date
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Show us a pic of the balancer and the flex plate. If u have factory parts then u need a balanced converter with 1 or 2 weights depending on the year. But each will swap out with each other. Kim
I'll snap some pictures when I can. I do have this balancer though. Summit Racing SUM-163318 Summit Racing™ OE-Style Harmonic Dampers | Summit Racing
transman
Well-Known Member
What year is the engine?
transman
Well-Known Member
This might be of some help to you.
These are factory weights.
These are factory weights.
DANGER! That page is WRONG! 1968 thru early 1972 340 motors used forged crankshafts. They were all neutral balanced [crank, harmonic balancer, flexplate, and convertor].
Later in 1972 they put cast iron crankshafts in them. This required a special harmonic balancer with '' for 340 cast crank only'' cast into them. Plus weights added to the front of the convertor to 'offset balance' the entire rotating assembly.
Later in 1972 they put cast iron crankshafts in them. This required a special harmonic balancer with '' for 340 cast crank only'' cast into them. Plus weights added to the front of the convertor to 'offset balance' the entire rotating assembly.
I didn't know that.... OP.. check your engine year
transman
Well-Known Member
I'm aware that the listing for the 340 is incorrect, should have marked that in the book some time back. But seeing as it is a 360 engine, and a 79 to boot, then the listing for either the CR25L or the CR25H is correct.I didn't know that.... OP.. check your engine year
If you get the B&M plate i posted you don't need to change the converter... the plate makes up the balance
transman
Well-Known Member
I'm glad to see that you chosen the route you're going. You never mentioned if the converter you've got is yours or something you've picked up. I see the photo of a transmission with the converter attached has been removed, but I'd like to point out that the weight that is welded on to the front cover is not a factory weight nor have I ever seen one like that from any of the converter builders I've dealt with over the years. Just my observation.
I did not trust the add on weight on that Summit harmonic balancer to be correct.
The description shows that it is for an LA360 and a lot of comments on that link say it has worked. Only one way to find out though once I install the flex plate.
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