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That's not quite right, the thread is the same (for a fixed cog and freewheel). The freewheel will screw on and about 2/3 of the threads will engage and be more than enough for every day use.
@c0gsucker - you should be fine with the hub you've got already, just stick a bunch of grease on the threads and use a freewheel that isn't made of cheese.
You need a new hub/wheel. The thread is different. For fixed it's a "stepped" thread with two different sizes for the cog and lockring, but for a freewheel it's one longer thread.