I have a 2006 short bed 4 wheel drive never taken to the shop but it has had a vibiration when it gets up to 55 mph it isnt bad but does anybody no what this is will be takin to the shop soon before the warranty runs out, it has 26,000 on it now.

 

bad tire?... possibly tire out of balance?.. I'd try checking the simple stuff first. Have you been rotating the tires?