340-904 thrust bearing/crank issue

have the converter checked to see if it balloon .......if so it will push the crank forward ruining the thrust bearing..
Yup, that's the most likely cause. I've had good luck having the crank thrust surface welded back up to specs so you might want to check into that option. If you don't EVER want to have it happen to you again, you could give me the car! :-) Otherwise, you cranks it up, you takes your chances.......