I have a 2002 F150 s'crew, 5.4L, 2WD and 159,000 miles. It has a shift it by ChickenEars that was installed at 85,000 miles. It has a rough shudder when shifting into third gear. No problems downshifting. I have changed fluid at 60,000 miles, 85,000 miles, 115,000 miles and 140,000 miles. On cold mornings when outside temperature is in mid 30s theres no shudder in shifting until it warms up then the shudder returns. Any help is appreciated.