I'm new to the forum and already solved two problems by reading some of the posts. My 99 f150,4X4 w/5.4 auto was having trouble between first and second during normal driving. Transmission shop replaced "an actuator spring" today then decided to keep it after roadtesting it. Said they ordered a new valve. Truck is still under used dealer warranty. Anything I should be aware of?

 

try disconnecting the battery, for 10-15min.s then drive the truck,

 

What are the symptoms of what it was doing?

 

As for the initial problem, the tranny was hesitating prior to entering second gear then would enter with a distinct kick. If you babied the accelerator the problem was minimal or non-existent. I just got the truck back from the tranny shop. The transition from first to second is markedly better, but not complete and now there is a kick as it re-enters first from second. Supposedly they replaced some type of valve. Have to call in the AM to tell them it's not right and make a new appt.