MECHMAN 320 amp high output alternator 1996-2004 GM Truck 4.3L 4.8L 5.3L 5.7L 6.0LSKU: 8206320 Availability: Most Alternators Are Custom Built To Order. Standard Build Time Is 2 3 Weeks. If You Need An Alternator Sooner Than That, Please Contact A Sales Associate To See If Any In Stock Options Are Available. Weight: 17 LBS 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