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Two vacuum lines connect to a plastic heating fitting on the housing, replace that with the fan switch.

Awesome! I don't even use those nipples, they are capped off from eliminating my emissions. I have a honda aluminum radiator and I was wondering about the fan switch. Thanks!

Well, it passed an alignment this morning. Started driving it a bit harder on the way home, there is a crazy vibration after letting off the gas in the upper rpm range. The drive shaft does not appear to be hitting the sway bar (the clearances are really close there), so I think the drive shaft must be flexing a bit. I am going to look into smaller carrier bearings for the drive shaft, I dont want the huge dsm stock bearing back in it.