http://www.toyota-4runner.org/4th-gen-t4rs/167943-have-you-ran-full-taco-suspension-swap-only-2.html
Check out that thread. It has the information you need. I just ordered my bushings for the rear but haven't installed them yet.
I owned a 2012 Tacoma Sport and I traded it in because of that problem along with a few others. It was fixed twice but would come back after a while. Pretty annoying on a 8 hour drive.
