Best ifs kit? rms, hdk, gt suspension, or magnum force?

Spun Bearing said
That question above doesn't make sense. It's like asking "Are you going to Cleveland or are you going
by bus?".

There seems to be some confusion here. You guys are mixing the TYPE of the spindle with the BRAND
of the spindle. The HDK uses a Mustang II (TYPE) 2" drop spindle that is available (BRAND) from eBay
(lower priced stuff), Wilwood (higher priced stuff) and probably a few dozen other places in between.

They choose to use this type because it gives the customer flexibility. They are the correct front steer
configuration and are standard street rod stuff, therefore the choices are many; just specify Mustang II
2" drop and pick your price bracket.

Ok, first off, a wilwood pro spindle is taller than a regular everyday Mustang 2 spindle, so by putting one or the other on, changes the instant center, therefore changing bump steer characteristics, you can't just use a taller spindle, so if a suspension is designed based off a regular everyday Mustang 2 spindle, that's the ONLY style spindle, that should be used, if it's designed for a wilwood pro, that's all that should be used, dropped or not, that makes no difference, it's the upper and lower ball joint distance between the pivot points that matter, and you can't simply shorten or lengthen that distance, and not change the geometry.