I've got jimz oil in my wife's Ex and haven't made the switch in either dually yet, but we both started our truck 2 days ago after sitting for for a couple of days and hers started in about half the time as mine. My truck has 212xxx, and hers has 177xxx miles. I think his oil is way better...
Sounds like a question for @Jimdawg185.
I use LE 8800 in my Excursion and haven't really paid attention to the sound, the wife drives it mainly, and haven't needed to change the oil in my other 2 yet. Just don't drive them that much.
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Ya what they said above a temp gun shooting the exhaust manifold close the head will show which are your problem areas, it will show abnormally cooler temps than the rest.
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Without knowing your skill level and tools it is had to say, but there is ton of info out there for these rearends. The hardest part is setting the bearing preload and backlash
I have done a couple of 7.3 manifold leaks while motor still in. The only ones that gave me trouble were the 4 or 5 bolt back. That whole is alot smaller than the rest. Had to cut bolt between manifold and head. Bolt came right out, but the part stuck in the manifold was a real MFer. If you...