Underdrive pulleys, do you really need the alternator pulley?
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Junior Member
Joined: Jul 2007
Posts: 31
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From: Montana
Car: 84 vette 85 vette
Engine: 350 crossfire, 350 TPI
Transmission: both 700R4
Axle/Gears: 84 vette 3.07, 85 vette 3.54
Underdrive pulleys, do you really need the alternator pulley?
Can I get away with the crank pulley only? Or will it really lower my alternator output?
Supreme Member
Joined: Sep 1999
Posts: 7,072
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From: Philly, PA
Re: Underdrive pulleys, do you really need the alternator pulley?
If you do a lot of sit-and-idle you'll want to do the alternator pulley. If you don't spend a lot of time idling, you don't absolutely need to change it. By the time you hit ~1200 RPMs the engine speed has more than made up for the difference in pulley ratio.
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bigjay89gta
Engine/Drivetrain/Suspension Parts for Sale
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Oct 15, 2015 08:04 AM
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