alternator pulley question
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I believe the later models all came with the decoupler. I just bought the unit attached and it comes with the decoupler and many suggest it's beneficial for supercharger applications. I've been using it for about 2 months and all levels of use and zero issues.
Powermaster 58969 Powermaster High-Amp Alternators | Summit Racing
Powermaster 58969 Powermaster High-Amp Alternators | Summit Racing
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GM Tech Service Bulletin #99-06-04-029A addresses the decoupling alternator pulley. This revised pulley was on all late model year 2000, and all 2001-2004 C5s with the A4 transmission. It took care of the squeal on earlier model C5s with Auto when shifting from Park to Reverse or Drive as well as other “rumble noise” that occurred when the AC kicked on, etc.
This retrofit was performed on our ‘99 many years ago and we have had no noise or vibration and without cranking mine up to check it right now, I believe it lets the alternator coast to a stop when the engine is turned off rather than having an abrupt hard stop.
Perhaps someone is aware of a workaround, but otherwise, it takes a special tool to make this conversion. A great benefit to having a son with a large, full-service garage is the plethora of tools in his gigantic tool box. 😉
This retrofit was performed on our ‘99 many years ago and we have had no noise or vibration and without cranking mine up to check it right now, I believe it lets the alternator coast to a stop when the engine is turned off rather than having an abrupt hard stop.
Perhaps someone is aware of a workaround, but otherwise, it takes a special tool to make this conversion. A great benefit to having a son with a large, full-service garage is the plethora of tools in his gigantic tool box. 😉
Race Director
Joined: Oct 2004
Posts: 12,859
Likes: 4,658
GM Tech Service Bulletin #99-06-04-029A addresses the decoupling alternator pulley. This revised pulley was on all late model year 2000, and all 2001-2004 C5s with the A4 transmission. It took care of the squeal on earlier model C5s with Auto when shifting from Park to Reverse or Drive as well as other “rumble noise” that occurred when the AC kicked on, etc.
This retrofit was performed on our ‘99 many years ago and we have had no noise or vibration and without cranking mine up to check it right now, I believe it lets the alternator coast to a stop when the engine is turned off rather than having an abrupt hard stop.
Perhaps someone is aware of a workaround, but otherwise, it takes a special tool to make this conversion. A great benefit to having a son with a large, full-service garage is the plethora of tools in his gigantic tool box. 😉
This retrofit was performed on our ‘99 many years ago and we have had no noise or vibration and without cranking mine up to check it right now, I believe it lets the alternator coast to a stop when the engine is turned off rather than having an abrupt hard stop.
Perhaps someone is aware of a workaround, but otherwise, it takes a special tool to make this conversion. A great benefit to having a son with a large, full-service garage is the plethora of tools in his gigantic tool box. 😉
