Last year bought a 99 grand prix gt off my brother. it has about 185000 miles now, had roughly 170000 when i bought it. a few days ago, it started shifting really hard once everything heats up. I already replaced the filter, and that made everything ten times better. But it's not where it should be. Thankfully, I work just a few miles from ZZ Performance, and plan to pick up a shift kit this week (regardless if it needs this, i've read way too many posts on here about how good it is to not use one while i'm already working on the the tranny). Best I can tell from the symptoms, and what I've read on here, the PCS needs to be replaced. Is there a thread somewhere on this site that gives directions to locating, removing, and replacing the PCS?