Can anybody tell my why my truck hops when im going about 7mph? its driving me nuts, when ever im stick in traffic my truck shakes and i look like a boob. im not sure of the gear ratio, but if that has something to do with it how can i fix it? my truck also makes a viberating noise when im going 45-50ish could it be the same problem? my brother said he herd a weir sound coming from the rear of the truck too.