Hozit GMTC members, found my way here from a google search for crank shaft pulleys. i've been into chevys all my life and its good to find such an active site !! I own a 1990 silverado duallie , reg cab ,7.4, 4 spd manual, 4X4, 6" lift, flowmaster exhaust, geardrive, had her for 15 years + and she's tons of fun !! Also a 1997 sonoma pickup ( father son project ) , ex cab, 4.3 vortec, automatic, flowmaster exhaust, got her a year ago and so far so good.