my advise to anyone doing this job is do it as soon as the pump starts making that marble sound I waited on my 2004 and the pump had a complete failure it ate the belt not a huge deal but then you must change the belt and the belt is actually harder to change then the pump plus you will be doing it on the side of the road and may or may not be towing at the time the pump blew apart and thank god I was able to fish out the impeller blades from the water jacket at the time I had about 60K on my 2004.5