Hunting?
 

Hi,
I've recently had my transmission rebuilt on my 07 dodge cummins. However it is back in the shop as we speak due to a shifting issue. Whats happening is as I'm driving anywhere from 30 to 65 mph the transmission goes to the gear below if i just give a little throttle but cycles back and forth between gears. I asked the rebuilder if he put new pressure solenoids in and he said yes along with a new billot torque converter and a new pump to try to fix the problem to no avail. I've heard talk about a noise filter. Should that be the next thing i should ask him to install? Any help would be appreciated.
Thanks,