I dont know what your talkin about coil overs, but coil springs are alot easier than replacing spindles, alot cheaper too, the only thing you have to consider is shock travel, I have a friend with chassis tech 3" coils and has no complaints, all you need is a spring compressor, get dat sh*t out, spindles are alot more work plus alighnment, but are sort of a better way to go if you got the loot, but there is still nothing wrong with coils. I have used chassis techs products before blocks and stuff no problem.