2000 supercab 4X4 3.0 automatic.(55,000 miles) when the truck is cold (first start in morning) it acts as if it doesn't want to shift into overdrive. it eventually does, a couple of miles down the road. truck shifts fine if warmed up. is this normal for this truck, or do i have need to worry? thanks ahead of time.

 

That's normal, it does that so the engine warms up faster.