It connects the upper and lower control arms and connecting to the steering tie rod end. (yourmechanic.com)
He also said that the tie rod ends showed very minimal play and did not need to be replaced for quite some time. (cars.com)
These disc brake systems not only upgrade your truck to disc brakes, they use 1973 - 87 ball joints and tie rod ends making future replacements a snap. (westernchassisinc.com)