Transmission Shutter

[Drrm80]

Well i just entered the PSD world, and also the diesel world . I picked up a 1995 F250 Ext Cab, LB, Auto ,4x4 with 113k miles for 5500$ . Ive been drivin it for about 4 days now and its been perfect. On the way home from school i got to about 70mph and the whole vehicle started to like shutter(shake) so i let off and noticed a huge power loss. So i got off the next exit and pulled over and drove home in back roads. It drove fine under 70mph. So when i got home i checked the fluid , it smelt good but it was about a 1qt low , so i added it. Then i took it down the highway 1 exit and it ran fine , went all the way to 80 no problem , got off the exit then got back on the highway towards my home and still drove fine. I drove it the rest of the night and this morning when i got up to goto school i got in it made it about 1 exit down at about 70 and it started to shutter again with a loss of power. So i turned around and went back home on the backroads and it drove fine. I just dropped it off at a Cottman Transmission shop to check it out and i was wondering if anyone else had any opinions i could get to add to the Tranny place's. Im thinkin the Torque COnverter after searching , i found this thread Trans Shuttering? but all the stuff isnt happening to me , only the shuttering past 70mph. Any help would be very appreciated.

[Drrm80]

let me add another symptom ive noticed maybe someone can give me a answer then. At Stop Signs ( when truck is at Idle it sometimes shuts off) No originally i thought it was the CPS, but with my other symptom on the highway im really leaning toward the Torque Converter. Vibration at highway speeds and sometimes stalling at idle....? Before i rip out the Torque Converter and put a new on in ...Is there a way to test any of the electronics that control the Torque converter locking and unlocking ? I have no check engine light and no other lights flashing.

[Eric B]

Its either a lock up solnoid not energizing all the time or t/c going bad It takes a lot more power to move the truck at 70 then is does at 50 or so, My guess would be the converter.