New Coil-Over Conversion Suspension
With an 18" wheel with any decent offset and width, I don't believe a 2" taller knuckle would fit. @BergmanAutoCraft has said he is running 1" taller balljoints so that would work, but I would bet that is the limit.
Note that the "inside" of the wheel above is just a line at 9" from the centerline. The wheel is going to take a chunk out of that distance.
With an 18" wheel with any decent offset and width, I don't believe a 2" taller knuckle would fit. @BergmanAutoCraft has said he is running 1" taller balljoints so that would work, but I would bet that is the limit.
Note that the "inside" of the wheel above is just a line at 9" from the centerline. The wheel is going to take a chunk out of that distance.