Need a good cooler with fan as already stated.... Also make sure your return line is adequate.. My experience as far as pumps they either work or don't (stock gm). Never really had one slowly go away. Once the pump was going it was down hill fast an did not come back.
Had truck once Rockwells locked f/r could not make lap around shop before steering gave up ...... Installed "big" cooler with fan, never had problem again.