A4wd binding while making sharp turns

I have a 1999 XLT Expedition with 193xxx Miles. I recently changed the transfer case and t-case motor. The t-case shifts into all modes a4wd, 4h and 4l. I did not see any vacuum lines behind the battery or an actuator near the front differential. Why would it bind with a new t-case and what could i check within the system?