I just joined this forum a short while ago and left an intro in the introduction section. I'd like to replace the (as far as I know) original radiator in my '05 Z71 5.3L to prevent future problems. 242,000 miles on the motor and it runs great, but the Tahoe is our back-up vehicle, not a daily driver. The previous owner, a good friend, performed a lot of work on this as he had meant to keep it but plans changed. I'll provide a list of what he performed. What are your recommendations for a new radiator?