transmission shifts late after driving on highway
 

Hello, I have 1996 Dodge Dakota V6 4x2 club cab. I've owned it since it was new. It has 118K miles on it. I had the transmission rebuilt in 2008 at abound 90k. Now I'm having another transmission problem.

When I start off and just drive in the city at slow speeds the transmission shifts smooth and at the correct speed/RPMs. However if I then drive on the highway, 60-70mph, and then exit back to city driving, the transmission then shifts late and at high RPMs. This will continue until I turn the truck off. As soon as I start out again, at city driving/slow speeds, the truck shifts correctly. Now when I exit the freeway and am at the stop light I turn the truck off, restart, and the truck shifts correctly. If I don't it will shift late at high RPMs.

Recent work includes a new battery June 2014 and I just replaced the transmission output speed sensor last weekend. Didn't help. Any ideas?

Thank you for reading and your time. Any and all replies are appreciated.

Is that the only thing that acts up? Revs the same, just shifts later?

Thank you for the reply. After I exit the highway I usually come to a stop at the light. When I accelerate from the green light the truck won't shift gears until about 3000-3200 RPMs.

When I just do city driving or before I get on the highway the truck shifts normally, at about 1600-1800 RPMs.