Is this just normal or when the curise is set?
I have the 5.9 and it does this all the time when I am going down hill. I think that is the trans dissingaging(bad spelling). Trying to save gas. I know a laugh right!

 

I thought a certain amount of that was normal, I know the 4.7 does unlock the TC when coasting, or at least I thought it did.

 

the tq is supposed to unlock when coasting, it is a fuel saving 'feature' so that the truck can coast longer before you need to give it more gas instead of the trans and engine being locked together and dragging downt he speed whenever you are off the gas.

 

No that guy I didn't clean the terminals. I know a simply job I was lazy today. I will do it tomorrow and test drive it. The thing that gets me. I've had this d for almost three years and this is the first its done it.

 

Things can go in an instant, all it takes is the right moment with the right conditions

 

Thats true. Well I'm going out to clean the terminals hopefully thats the problem.

 

When cleaning the terminals be sure to check the wires to and from the battery (both ends) for corrosion, even if the terminals are clean, if any connection is corroded out it can cause a problem

 

Sharp is right, every Durango came with a unlocking torque converter so when you let off the throttle the converter comes unlocked from the engine and turns on a clutch system. This way it is like going into a neutral position, yet still turns the motor just not at a the same RPM. This is a fuel saving feature, and also a mechanical saving feature. It has always been there, you just finally noticed. Take a look in the service manual and it will explain it further if needed.

Now it could be doing it more and that is why you just noticed it, in which case your TPS might need to be replaced.

 

Agree with the TPS. That solved my problem once.