My transmission seems to be slipping...torque converter??

Yes it is full. Seems to be slipping in all the forward gears in drive. Slips more with throttle. Car still moves just much slower acceleration. Shifts seem solid at about the right speeds. No flare when shifting. Just feels mushy on accelerating. Like i said clutches and bands were fine. Bands were torqed to spec. The valve body was clean. Did notice some wear on the separator plate where the check balls sit. Shift linkage may be a little off. 1st gear on the pushbuttons doesn't push in. I lined it up in neutral on the safety switch. So does anyone know if the changes I made would affect the stock tourque converter setup? I'm not so sure its the trans. Everything looked good when I was in there but I'm no expert.