Quick view Mechman Mechman High Output 400 Amp Alternator 1996-2004 GM Truck 4.3L 4.8L 5.3L 5.7L 6L Duplicolor-1652 Now: $599.00 MSRP: $699.00 Was: Installation Notes: This unit comes equipped with a smaller 1.75 inch diameter alternator pulley, and will require a slightly shorter drive belt for proper belt tension. Not recommended for sustained use above 5,000 RPM eng… Add to Cart The item has been added Add To Compare