I bought a torque coverter 12 years ago best converter i owned until trans blew and now cant get motor to run correctly.
I was told from a&a it was a j converter but the part number doesnt seem rigjt to me if anyone can tell me what converter it is

Turbo-action J converter part # is 17509-J. That being said I think B&M are the originators of it so it could be theirs. They were built off a Morris-Minor core and many companies used them for various applications till the supply ran out. The torque converter can make or break a combination. If it can't be modified to what you need sell it and get what the converter company recommends.

Been trying to figure out this part number car hasnt ran great since it blew

I was told that the original B&M 069J Mopar race converters were built from English Ford Cortina cores, not sure about the T/A 069J converters
I was lucky enough to get an original stock unmodified B&M 069J converter , it was great
Until I broke it beyond repair

At some point in time they used Opal converters.

If they ever build a Museum for converters the O69J would be the main attraction.

I had heard that they use the Opal converters also

I spoke to a guy much closer than I to converter development back in the day and he said Falcon, Cortina and Opal converters were used in various applications.

Can’t recall in what order they were used between the Cortina and Opal. The Falcon was believed to be used in the old 6877F
Which I believe was the predecessor to the Cortina and Opal. I think a tad larger than the other two.