I've got the exact same problem with mine right now. I took it to the dealership to get the tranny looked at and asked them to look into the knocking too, anyway, they said what Compshooter said, but they were gonna charge me $120 for the job!!! Thanx for startin this thread and thanx ALOT to Compshooter for the info and link!
2000 SE. 2" ProComp Lift, 32"x11.5" MTR's, AirRaid intake, Hesco throttle body spacer, JET Stage 1 Chip, Redline Performance Chip, a couple of KC's.