I found a post on here that showed a picture of the difference between the input shafts. I think you can do a web search also and find the info. I just went through this with my 82 Eagle.It had a lockup trans in it, I got a used one it was a non-lockup from an 88 , but mistankingly came with a lock up converter. Check above in my reply,I have since gotten mine from - tourqueconverter1 - dot - com . It shipped here in 2 - 3 days USPS from Cali. - to NY converter and shipping under $120 ---- thay are a mass rebuilder supplier, I am happy with it so far, no issues, comes with a warrenty, and longer warrenty for more $$$ of course.They get away with cheap shipping useing those one rate priority boxes from the post office.
Another tip - bieng it is a new converter - I cut out a round piece of cardboard a little bigger than the converter base held it up to the flex plate, punched holes through it where the bolts go , marked the bottom hole, ( or which ever one you want to ), marked that hole and the one on the flex plate it matches, then when I got the converter, I matched the cardboard to it's holes and marked the one that matches the one on the flew plate. It saved alot of hassle trying to match them up once it is in..........jusy IMO.