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Thread: need help
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03-02-2009, 09:45 AM #1
- Join Date
- May 2006
- Location
- S. Texas
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- 42
- Posts
- 2
gold- 1998 trans am
need help
hey guys wats the difference between the underdrive and overdrive pulleys of the alternator? is there a difference in size?
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03-02-2009, 08:39 PM #2
- Join Date
- Aug 1999
- Location
- Arizona
- Posts
- 51,364
Black- 383 Procharged & N20 Vert
An underdrive has a larger pulley allowing the engine to spin the alternator slower.
Black 1999 Blown Convertible A4
Forged 383 | ATI D-1SC
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Black 2009 Escalade Hybrid 4WD
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