2005 5.9 Ram build.

So far I think my new plan is this.

Pull Trans and rebuild / have rebuilt.
Install coolent bypass
Replace radiator, (looks to have had a very small leak)
Replace Trans heat exchanger and engine oil heat exchanger.

Flush the Trans cooler and lines.

Install Hydro assist steering

Put everything back together and drive it while I save up for a new long block in a few years.