No issues removing OEM shift knob. All it required was Duct Tape, a strap wrench that you can buy for 10 bucks at Lowes, and some sort of wrench.
Inside your knob they have loctite around the first couple of threads...harder ones probably more. Once you break that seal its easy peasy. The last pic is of the inside of the OEM shift knob..notice the crud..thats loctite.
