I have done something similar. I have the same lift with 3/4” spacers out back and 0.5” Clayton springs up front. I have JKS front fixed lower control arms and a JKS front track bar…
I wish we knew why some motors go for 250K without needing cams, and some have it happen during warranty. I wonder if the pro master and gladiator have it in higher frequencies, could it be due to that fact that they are worked harder? I am thinking I’d towing, loaded with tools, beds full, etc?