A and A used to sell a kit that did what you want. You could do the needle in a haystack thing and find it in an early six cylinder trans. One of my luckiest finds ever was asking my trans guy if he had one. He literally reached about three feet away and pulled out a complete setup. He said it had laid there for many years just in case. He rebuilt them all, but he was about as hardcore a mopar guy as you’ll meet.