Found the rattle in my bellhousing.
 

https://cimg9.ibsrv.net/gimg/www.che...01b05f8ad4.jpg
1994 zj. Bought it for $600, emaculate interior, almost new engine, strange rattle and shifting issues. I figured it was a cracked flex plate and probably the 3-4 solenoid, until I pulled the tranny and took the torque converter out.
picked up a parts zj for $50 and threw the tranny in. I've done hundreds of transmissions but this is a first for me, so I figured I'd share it.