Hello all, So I was trying to order a speedo drive gear for my 78 K5, th350, np203. As soon as i call up they ask me "color code/number of teeth?" I have no idea. My t-case doesnt have a speedo gear right now so i have no idea what to order. I have 4.11 ratio in the back and am running 35 inch tires. I called an auto parts store and the chevy parts desk and neither could tell me which i needed. Can any of you gurus help a guy out? Thanks.