You only need crossover if you are planning to do major offroading that will cause you to cycle your suspension fully. With a stock setup if you have extreme droop on the driver front corner the drag link will be placed at am extreme angle, limiting steering. For most applications the stock steering system is adequate.
With a crossover system you will experience more bump steer coming from the passenger side. If setup with good geometry it won't be too noticeable.
High steer is all about getting the tie rod up above the springs and out of the way of rocks and debris, again most beneficial for offroad rigs.
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Jason M. @argonaut62
1972 K5 Blazer CST,
Turquoise
1966 K20 Short Fleet Pickup,
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2001 Porsche 911 Carrera
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No dis-assemble Johnny Five! No dis-assemble!