grunt on start up

For the last couple of days on cold starts, I hear a grunt from the drivers side. Sounds like a cold belt not turning cold. I've done the following to this 98 with 130,000 miles: New trans from Detroit :15millionsign: , 3rd water pump :crying: , all belts replaced, new alternator :cya: , several electrical items including headlight blinking problem and wiper problems (can't remember exactly what they did but it cost me a arm and two legs, one finger and a toe.) :banghead: Anyway now I'm getting this grunt on cold start up. One morning I noticed the water pump belt was screaming, :shakehead applied some belt ease and it stopped. Could it be the belt or is there an idler arm puller in there I can't see? This almost sounds like some sort of air valve or pollution control device growning from the drivers side. I don't think this is a pulley and you hear it on the inside more than the outside. Could something be up with the brake booster? Any input would be appreciated. :1zhelp:

98 Autobahn Aurora
06 Pontiac GTO M6
72 Sierra Grande GMC Fleetside (13.29 1/4 All throttle no bottle)

I didn't think I would get much reaction to this one so here's another for ya, I think this grunt is coming from maybe the self leveling or some sort of air pump for the shocks, can anyone comment?

Ok, this morning it didn't do it but I turned off all power accessories before starting. Any ideas?:banghead: