TCC shudder 92 Park Ave, 3.8, 4T60E

Ok, Need some help. This car has a shudder at highway speeds, more noticeable when going up hill. Using the Tech 2, I can command the TCC on,
and some of the time it will shudder, ( slip speed between 100-200 RPM, Duty cycle at 0%), sometimes pwm at 3-8% and 0-15RPM slip- no shudder. Either way, during uphill driving, I can command TCC off and it stops. I think the problem is in the transaxle, but part of me suspects the PCM ( knowing that they had problems). Has this happened to anyone? TIA. Cam
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.