Similar TQ issue?

[08F150]

Originally Posted by SubiGT

My shudder happened both before and after the Gryphon, in fact, it's one of the reasons I got the Gryphon. It is much more pronounced with the AC on, but it still occurs with the AC off. I have set the PID's to monitor input vs. output RPM's, and observed no change while I felt the shudder occur. My TFT never gets above 153, and I'm getting 18+mpg on the canned 93tune. I'll monitor and adjust the various transmissions settings once I get the 87perf tune that I'm waiting for.

Do you have lots of milage on your truck? Have you ever serviced the trans? I have worked on many fords over the years that have a 4r70w trans and have convertor shudder issues. Feels like going over some washboard road, usualy occurs when the torque starts to lock up at light throttle. Most of the time its cured with a simple trans flush with the proper oil. The additives in the oil breaks down after time not allowing the converter clutch to apply smoothly. Just be sure to do a complete flush.