Having reman 5R55s installed. Radiator, lines, cooler

[08EddieCA]

i have a 2008 4.0l v6 with 128k odo. 4x4. No reverse etc.
I'm having a reman unit installed. Tech can flush my cooler lines, cooler, but not sure about radiator.
If I can get these extra parts would it be with the extra expense? I'm looking for longevity.

 

[08EddieCA]

Tech now wants to replace cooler lines to and from trans, radiator, and cooler. He says he can't guarantee all impurities can be flushed thoughouly. Sounds right to me. He said I can source the parts myself if I prefer. He's giving me a three year warranty now. Sound right?

 

[08EddieCA]

Any suggestion on Radiator I should buy? Considering a B&M Fan Transmission Oil Cooler instead of the stock cooler.