Liquid wrench and pop it with a hammer a few times on a socket two sizes smaller on an extension. The vibration works the LW into the threads.
You have to let it sit a while after whacking it.
I did this on a 1 1/4 inch nut on the rear suspension of a 1 ton dually.
I still had to use a 3 foot cheater on the end of a 24 inch 3/4 inch ratchet handle. It had defied legs + arms + back before I put the liquid wrench to it and gave it a few whacks. It CREEEEEKed loudly all 4 inches of the bolt when it came loose.
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2010 Titan Crewcab XE
had an 07 S Brilliant Silver
had an 04 SL Sheer Silver
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