I did the Redhead a few months ago. My OEM had 175K on it and had seen better days. So far, so good!
Replaced the worn out Revo 2s with Toyo open Country R/Ts a few weeks ago too. Feel fine now but jury is out on them until the end of the season at least. I have plans.
Did you send your box in direct to Redhead for a rebuild or buy a box from a reseller and send your core in?
I have an '06 2500HD Duramax with 140k and it has some steering wobble. I need to replace the tie rod ends, I am sure, but wouldn't mind an upgrade.