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I had purchased the ASP pulleys (crank and alt set) a few weeks ago and installed them. The charge of the alternator was a little low with the new pulleys. I finally decided to take them off and put the stock ones back on because right now reliability is more important than small power gains with my commute to college. After I took them off, the alternator started overcharging, just about one line away from the red area. The gauge would jump all over the place and if I had my headlights on they would go dim and then bright again and back and forth. Just a few days later the car felt like it was going to shut off when I was not on the throttle. I went to Pep Boys this morning and got my battery and alternator checked and they said everything was fine, but the problems usually don't begin until a few minutes after I start the car. I still thought there was something wrong with the alternator so I got a new one and installed it this morning and now everything works perfectly. Fortunately the alternator was free because there was a lifetime warrantee on it. I only had to pay the diagnostic fee.
So anyway, from my experience I would recommend not messing with your pulleys. The aftermarket pulleys have been only a problem for me. If you have another car that you could rely on if something goes wrong with your f-body, then I'd say go for it, but if your third gen is your only car and your daily driver like mine is, I would stay away from the pulleys. Just thought I'd let you guys know so you can avoid the trouble I had to go through.
So anyway, from my experience I would recommend not messing with your pulleys. The aftermarket pulleys have been only a problem for me. If you have another car that you could rely on if something goes wrong with your f-body, then I'd say go for it, but if your third gen is your only car and your daily driver like mine is, I would stay away from the pulleys. Just thought I'd let you guys know so you can avoid the trouble I had to go through.
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