the idea is to get zero deflection. so rod end. but on the street they where veryfast and are noisy. i would recomend you go with a adj type lower with poly ends. stiffer than a stock rubber but not loud like a rod end. if you do a ajd tq arm you need the adj lowers. a small pinion angle change can do wonders. I have spohn adj tq arm and tranny mount, adj panhard bar for my 89 camaro and im plannin on getting the ajd lowers offset. all with rod ends. i want the full drag race suspension noise dont matter, it has no sound deadner either just carpet.