2006 Dodge Dakota SLT 4.7L V8 5 Speed 4x4

I just installed a new transmission into my truck.
What happens is when i am coming to a stop in drive or reverse the truck stalls and will occasionally die. I have done several tests and replaced several parts and i cannot figure out what the peoblem is.
I know it isn't the transmission or torque converter, i had a friend look at it, my friend worked at a dodge dealership for years and he was the transmission tech. I have replaced the PCV Valve, the Idle air Controller, and the Spark Plugs.
Do you guys have any ideas?
The next thing im going to check is the fuel filter

 

Is it throwing any codes?

 

Nope.

 

I had this happen after I did a coolant service and had the battery disconnected for 3 days. Kept dying when coming to a stop. I checked and rechecked my work thinking I had done something wrong. After a couple weeks it cleared up.

 

Did you ever figure out what was causing the problem?

 

It was 4 years ago. I'd be guessing on the cause. Mine was not an all the time thing, but at least once a day it'd stall when coming to a stop.

 

Is it stalling due to just failure to maintain idle, or does it feel like it's coming to a stop in a manual transmission without releasing the clutch? Mine would do the latter, and after a couple of false starts a mechanic figured out that the torque converter lockup clutch disc was disintegrating and plugging the ports, not allowing it to release.