After reading the responses from other manufactures and talking to the builder that RPMExtreme uses they are all in the same boat of trying to keep there radiators from the stresses they go thru.
I just received my new radiator and it looks solid, plus it is the 52mm up from the original 48mm that I had originally installed. One thing stated was they are trying to strengthen the cores up but you can only go so far before they become to rigid, then they just crack because from lack of ability to flex at all.
I can not remember now all the numbers but he did state that the materials used where all thicker than the standard assemblies. Headers, tubes, fin's and tanks all using the thicker metals. Plus strengthening of the corner areas.
I was hoping to install it this weekend but a spring freeze and ice showed up Sat. So first part of next week we will see how it goes. Hopefully this is the fix.
I am not adding any more of the tablets to this one, as I did not drain the system and do not want to over do it with additives.
2007 JKU X, 6.0 ls and 6L80e with a diy kit from RpmExtreme, 4.10, 4" ProComp Stage 1 lift, AEV drop brackets, 325/65R18 Nitto Terra Grapplers, Eagle Offroad Alloys 18"x10"